MCQ (Single Correct Answer)

1

Match the LIST-I with LIST-II

LIST-I LIST-II
A. Carbocation I. Species that can supply a pair of electrons.
B. C-Free radical II. Species that can receive a pair of electrons.
C. Nucleophile III. sp2 hybridized carbon with empty p-orbital.
D. Electrophile IV. sp2/sp3 hybridized carbon with one unpaired electron.

Choose the correct answer from the options given below:

JEE Main 2025 (Online) 8th April Evening Shift
2

What is the correct IUPAC name of the compound?

JEE Main 2025 (Online) 8th April Evening Shift Chemistry - Basics of Organic Chemistry Question 15 English
JEE Main 2025 (Online) 8th April Evening Shift
3

The descending order of basicity of the following amines is :

JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Basics of Organic Chemistry Question 10 English 1

JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Basics of Organic Chemistry Question 10 English 2

JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Basics of Organic Chemistry Question 10 English 3

(D) $ \mathrm{CH}_3 \mathrm{NH}_2$

(E) $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$

Choose the correct answer from the options given below :

JEE Main 2025 (Online) 7th April Evening Shift
4

The number of optically active products obtained from the complete ozonolysis of the given compound is :

JEE Main 2025 (Online) 7th April Evening Shift Chemistry - Basics of Organic Chemistry Question 9 English
JEE Main 2025 (Online) 7th April Evening Shift
5

Which of the following is the correct IUPAC name of given organic compound (X)?

JEE Main 2025 (Online) 7th April Morning Shift Chemistry - Basics of Organic Chemistry Question 11 English

JEE Main 2025 (Online) 7th April Morning Shift
6

The IUPAC name of the following compound is:

JEE Main 2025 (Online) 4th April Evening Shift Chemistry - Basics of Organic Chemistry Question 6 English

JEE Main 2025 (Online) 4th April Evening Shift
7

In which pairs, the first ion is more stable than the second?

JEE Main 2025 (Online) 4th April Evening Shift Chemistry - Basics of Organic Chemistry Question 5 English

JEE Main 2025 (Online) 4th April Evening Shift
8

The correct order of basicity for the following molecules is :

JEE Main 2025 (Online) 4th April Evening Shift Chemistry - Basics of Organic Chemistry Question 4 English

JEE Main 2025 (Online) 4th April Evening Shift
9

$$ \text { What is the correct IUPAC name of } $$

JEE Main 2025 (Online) 3rd April Evening Shift Chemistry - Basics of Organic Chemistry Question 3 English ?

JEE Main 2025 (Online) 3rd April Evening Shift
10

Given below are two statements :

Statement I : Hyperconjugation is not a permanent effect.

Statement II : In general, greater the number of alkyl groups attached to a positively charged Catom, greater is the hyperconjugation interaction and stabilization of the cation.

In the light of the above statements, choose the correct answer from the options given below

JEE Main 2025 (Online) 3rd April Evening Shift
11

$$ \text {Identify the correct statements from the following. } $$

JEE Main 2025 (Online) 3rd April Morning Shift Chemistry - Basics of Organic Chemistry Question 8 English

$$ \text {Choose the correct answer from the options given below: } $$

JEE Main 2025 (Online) 3rd April Morning Shift
12

$$ \text { The least acidic compound, among the following is: } $$

JEE Main 2025 (Online) 3rd April Morning Shift Chemistry - Basics of Organic Chemistry Question 7 English
JEE Main 2025 (Online) 3rd April Morning Shift
13
In 3,3-dimethylhex-1-en-4-yne, there are _________$\mathrm{sp}^3$,_________$\mathrm{sp}^2$ and_________ sp hybridised carbon atoms respectively.
JEE Main 2025 (Online) 2nd April Evening Shift
14

Consider the following compound (X)

JEE Main 2025 (Online) 2nd April Morning Shift Chemistry - Basics of Organic Chemistry Question 14 English

The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding $\mathrm{C}-\mathrm{H}$ bond are :

JEE Main 2025 (Online) 2nd April Morning Shift
15

Designate whether each of the following compounds is aromatic or not aromatic.

JEE Main 2025 (Online) 2nd April Morning Shift Chemistry - Basics of Organic Chemistry Question 13 English

JEE Main 2025 (Online) 2nd April Morning Shift
16

Given below are two statements :

Statement (I): On nitration of m-xylene with $\mathrm{HNO}_3, \mathrm{H}_2 \mathrm{SO}_4$ followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid is obtained as the major product.

Statement (II) : $-\mathrm{CH}_3$ group is o/p-directing while $-\mathrm{NO}_2$ group is m-directing group.

In the light of the above statements, choose the correct answer from the options given below :

JEE Main 2025 (Online) 29th January Evening Shift
17

Given below are two statements :

Statement (I): In partition chromatography, stationary phase is thin film of liquid present in the inert support.

Statement (II): In paper chromatography, the material of paper acts as a stationary phase.

In the light of the above statements, choose the correct answer from the options given below :

JEE Main 2025 (Online) 29th January Evening Shift
18

Match List - I with List - II.

List - I (Structure) List - II (IUPAC Name)
(A) JEE Main 2025 (Online) 29th January Morning Shift Chemistry - Basics of Organic Chemistry Question 31 English 1 (I) 4-Methylpent-1-ene
(B) (CH3)2C(C3H7)2 (II) 3-Ethyl-5-methylheptane
(C) JEE Main 2025 (Online) 29th January Morning Shift Chemistry - Basics of Organic Chemistry Question 31 English 2 (III) 4,4-Dimethylheptane
(D) JEE Main 2025 (Online) 29th January Morning Shift Chemistry - Basics of Organic Chemistry Question 31 English 3 (IV) 2-Methyl-1,3-pentadiene

Choose the correct answer from the options given below :

JEE Main 2025 (Online) 29th January Morning Shift
19

Total number of nucleophiles from the following is :

JEE Main 2025 (Online) 29th January Morning Shift Chemistry - Basics of Organic Chemistry Question 30 English

JEE Main 2025 (Online) 29th January Morning Shift
20

Given below are two statements:

Statement I:JEE Main 2025 (Online) 28th January Evening Shift Chemistry - Basics of Organic Chemistry Question 25 English 1 and JEE Main 2025 (Online) 28th January Evening Shift Chemistry - Basics of Organic Chemistry Question 25 English 2 are isomeric compounds.

Statement II: JEE Main 2025 (Online) 28th January Evening Shift Chemistry - Basics of Organic Chemistry Question 25 English 3 and JEE Main 2025 (Online) 28th January Evening Shift Chemistry - Basics of Organic Chemistry Question 25 English 4 are functional group isomers.

In the light of the above statements, choose the correct answer from the options given below:

JEE Main 2025 (Online) 28th January Evening Shift
21

The correct order of stability of following carbocations is :

JEE Main 2025 (Online) 28th January Morning Shift Chemistry - Basics of Organic Chemistry Question 17 English

JEE Main 2025 (Online) 28th January Morning Shift
22

In the given structure, number of sp and $\mathrm{sp}^2$ hybridized carbon atoms present respectively are :

JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Basics of Organic Chemistry Question 18 English

JEE Main 2025 (Online) 24th January Evening Shift
23

Identify correct statement/s :

(A) $-\mathrm{OCH}_3$ and $-\mathrm{NHCOCH}_3$ are activating group.

(B) $\quad-\mathrm{CN}$ and -OH are meta directing group.

(C) -CN and $-\mathrm{SO}_3 \mathrm{H}$ are meta directing group.

(D) Activating groups act as ortho - and para directing groups.

(E) Halides are activating groups.

Choose the correct answer from the options given below :

JEE Main 2025 (Online) 24th January Evening Shift
24

Which one of the carbocations from the following is most stable?

JEE Main 2025 (Online) 24th January Morning Shift
25

The correct stability order of the following species/molecules is :

JEE Main 2025 (Online) 23rd January Morning Shift Chemistry - Basics of Organic Chemistry Question 23 English

JEE Main 2025 (Online) 23rd January Morning Shift
26

The most stable carbocation from the following is :

JEE Main 2025 (Online) 22nd January Evening Shift
27

How many different stereoisomers are possible for the given molecule?

JEE Main 2025 (Online) 22nd January Morning Shift Chemistry - Basics of Organic Chemistry Question 27 English

JEE Main 2025 (Online) 22nd January Morning Shift
28

The incorrect statements regarding geometrical isomerism are :

(A) Propene shows geometrical isomerism.

(B) Trans isomer has identical atoms/groups on the opposite sides of the double bond.

(C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene.

(D) 2-methylbut-2-ene shows two geometrical isomers.

(E) Trans-isomer has lower melting point than cis isomer.

Choose the correct answer from the options given below :

JEE Main 2025 (Online) 22nd January Morning Shift
29

The IUPAC name of the following compound is :

JEE Main 2025 (Online) 22nd January Morning Shift Chemistry - Basics of Organic Chemistry Question 26 English

JEE Main 2025 (Online) 22nd January Morning Shift
30

The correct stability order of the following resonance structures of $$\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}$$ is

JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Basics of Organic Chemistry Question 62 English

JEE Main 2024 (Online) 9th April Evening Shift
31

Total number of stereo isomers possible for the given structure :

JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Basics of Organic Chemistry Question 61 English

JEE Main 2024 (Online) 9th April Evening Shift
32

Relative stability of the contributing structures is :

JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Basics of Organic Chemistry Question 56 English

JEE Main 2024 (Online) 9th April Morning Shift
33

Correct order of basic strength of Pyrrole JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Basics of Organic Chemistry Question 59 English 1, Pyridine JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Basics of Organic Chemistry Question 59 English 2 and Piperidine JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Basics of Organic Chemistry Question 59 English 3 is :

JEE Main 2024 (Online) 9th April Morning Shift
34

For the given compounds, the correct order of increasing $$\mathrm{pK}_{\mathrm{a}}$$ value :

JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Basics of Organic Chemistry Question 57 English

Choose the correct answer from the options given below :

JEE Main 2024 (Online) 9th April Morning Shift
35

Methods used for purification of organic compounds are based on :

JEE Main 2024 (Online) 9th April Morning Shift
36

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is:

$$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}, \mathrm{HCOOH}$$

JEE Main 2024 (Online) 8th April Evening Shift
37

IUPAC name of following hydrocarbon(X) is :

JEE Main 2024 (Online) 8th April Evening Shift Chemistry - Basics of Organic Chemistry Question 47 English

JEE Main 2024 (Online) 8th April Evening Shift
38

Which of the following are aromatic?

JEE Main 2024 (Online) 8th April Morning Shift Chemistry - Basics of Organic Chemistry Question 45 English

JEE Main 2024 (Online) 8th April Morning Shift
39

Given below are two statements :

JEE Main 2024 (Online) 8th April Morning Shift Chemistry - Basics of Organic Chemistry Question 43 English

In the light of the above statements, choose the most appropriate answer from the options given below:

JEE Main 2024 (Online) 8th April Morning Shift
40

JEE Main 2024 (Online) 6th April Evening Shift Chemistry - Basics of Organic Chemistry Question 36 English

The correct arrangement for decreasing order of electrophilic substitution for above compounds is :

JEE Main 2024 (Online) 6th April Evening Shift
41

The incorrect statement regarding the geometrical isomers of 2-butene is :

JEE Main 2024 (Online) 6th April Evening Shift
42

Functional group present in sulphonic acids is :

JEE Main 2024 (Online) 6th April Morning Shift
43

Which of the following is metamer of the given compound (X) ?

JEE Main 2024 (Online) 6th April Morning Shift Chemistry - Basics of Organic Chemistry Question 34 English

JEE Main 2024 (Online) 6th April Morning Shift
44

The correct nomenclature for the following compound is :

JEE Main 2024 (Online) 5th April Evening Shift Chemistry - Basics of Organic Chemistry Question 40 English

JEE Main 2024 (Online) 5th April Evening Shift
45

Match List - I with List - II.

LIST I
(Pair of Compounds)
LIST II
(Isomerism)
A. n-propanol and Isopropanol I. Metamerism
B. Methoxypropane and ethoxyethane II. Chain Isomerism
C. Propanone and propanal III. Position Isomerism
D. Neopentane and Isopentane IV. Functional Isomerism

Choose the correct answer from the options given below :

JEE Main 2024 (Online) 5th April Evening Shift
46

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Cis form of alkene is found to be more polar than the trans form.

Reason (R) : Dipole moment of trans isomer of 2-butene is zero.

In the light of the above statements, choose the correct answer from the options given below :

JEE Main 2024 (Online) 5th April Morning Shift
47

Correct order of stability of carbanion is :

JEE Main 2024 (Online) 4th April Evening Shift Chemistry - Basics of Organic Chemistry Question 50 English

JEE Main 2024 (Online) 4th April Evening Shift
48

What will be the decreasing order of basic strength of the following conjugate bases? $${ }^{-} \mathrm{OH}, \mathrm{R} \overline{\mathrm{O}}, \mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}, \mathrm{Cl}$$

JEE Main 2024 (Online) 4th April Morning Shift
49

Match List I with List II :

LIST I
Mechanism steps
LIST II
Effect
A. JEE Main 2024 (Online) 4th April Morning Shift Chemistry - Basics of Organic Chemistry Question 52 English 1 I. $$-$$ E effect
B. JEE Main 2024 (Online) 4th April Morning Shift Chemistry - Basics of Organic Chemistry Question 52 English 2 II. $$-$$ R effect
C. JEE Main 2024 (Online) 4th April Morning Shift Chemistry - Basics of Organic Chemistry Question 52 English 3 III. $$+$$ E effect
D. JEE Main 2024 (Online) 4th April Morning Shift Chemistry - Basics of Organic Chemistry Question 52 English 4 IV. $$+$$ R effect

Choose the correct answer from the options given below :

JEE Main 2024 (Online) 4th April Morning Shift
50

Which among the following is incorrect statement?

JEE Main 2024 (Online) 4th April Morning Shift
51
The set of meta directing functional groups from the following sets is :
JEE Main 2024 (Online) 1st February Evening Shift
52
Lassaigne's test is used for detection of :
JEE Main 2024 (Online) 1st February Evening Shift
53
The functional group that shows negative resonance effect is :
JEE Main 2024 (Online) 1st February Evening Shift
54
Ionic reactions with organic compounds proceed through :

(A) homolytic bond cleavage

(B) heterolytic bond cleavage

(C) free radical formation

(D) primary free radical

(E) secondary free radical

Choose the correct answer from the options given below :
JEE Main 2024 (Online) 1st February Morning Shift
55
Which of the following compound will most easily be attacked by an electrophile?
JEE Main 2024 (Online) 1st February Morning Shift
56

Identify structure of 2,3-dibromo-1-phenylpentane.

JEE Main 2024 (Online) 31st January Evening Shift
57

The correct order of reactivity in electrophilic substitution reaction of the following compounds is :

JEE Main 2024 (Online) 31st January Evening Shift Chemistry - Basics of Organic Chemistry Question 75 English

JEE Main 2024 (Online) 31st January Evening Shift
58

A species having carbon with sextet of electrons and can act as electrophile is called

JEE Main 2024 (Online) 31st January Morning Shift
59

Given below are two statements:

Statement I: IUPAC name of $$\mathrm{HO}-\mathrm{CH}_2-\left(\mathrm{CH}_2\right)_3-\mathrm{CH}_2-\mathrm{COCH}_3$$ is 7-hydroxyheptan-2-one.

Statement II: 2-oxoheptan-7-ol is the correct IUPAC name for above compound. In the light of the above statements, choose the most appropriate answer from the options given below:

JEE Main 2024 (Online) 31st January Morning Shift
60

The correct stability order of carbocations is

JEE Main 2024 (Online) 30th January Evening Shift
61

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

JEE Main 2024 (Online) 30th January Evening Shift
62

IUPAC name of following compound is :

JEE Main 2024 (Online) 30th January Evening Shift Chemistry - Basics of Organic Chemistry Question 65 English

JEE Main 2024 (Online) 30th January Evening Shift
63

Which of the following molecule/species is most stable?

JEE Main 2024 (Online) 30th January Morning Shift
64

According to IUPAC system, the compound

JEE Main 2024 (Online) 29th January Evening Shift Chemistry - Basics of Organic Chemistry Question 67 English

is named as

JEE Main 2024 (Online) 29th January Evening Shift
65

The ascending acidity order of the following H atoms is

JEE Main 2024 (Online) 29th January Evening Shift Chemistry - Basics of Organic Chemistry Question 68 English

JEE Main 2024 (Online) 29th January Evening Shift
66

Which one of the following will show geometrical isomerism?

JEE Main 2024 (Online) 29th January Evening Shift
67

The interaction between $$\pi$$ bond and lone pair of electrons present on an adjacent atom is responsible for

JEE Main 2024 (Online) 29th January Morning Shift
68

The order of relative stability of the contributing structure is :

JEE Main 2024 (Online) 27th January Evening Shift Chemistry - Basics of Organic Chemistry Question 80 English

Choose the correct answer from the options given below :

JEE Main 2024 (Online) 27th January Evening Shift
69

The incorrect statement regarding conformations of ethane is :

JEE Main 2024 (Online) 27th January Evening Shift
70

Bond line formula of HOCH(CN)$$_2$$ is :

JEE Main 2024 (Online) 27th January Evening Shift
71

Which of the following is strongest Bronsted base?

JEE Main 2024 (Online) 27th January Morning Shift
72

Which of the following has highly acidic hydrogen?

JEE Main 2024 (Online) 27th January Morning Shift
73

Cyclohexene

JEE Main 2024 (Online) 27th January Morning Shift Chemistry - Basics of Organic Chemistry Question 87 English

is ________ type of an organic compound.

JEE Main 2024 (Online) 27th January Morning Shift
74

IUPAC name of following compound (P) is:

JEE Main 2024 (Online) 27th January Morning Shift Chemistry - Basics of Organic Chemistry Question 86 English

JEE Main 2024 (Online) 27th January Morning Shift
75
Which of the following statement is correct for paper chromatography?
JEE Main 2023 (Online) 15th April Morning Shift
76

Given below are two statements :

Statement I : Tropolone is an aromatic compound and has $$8 \pi$$ electrons.

Statement II : $$\pi$$ electrons of $$ > \mathrm{C}=\mathrm{O}$$ group in tropolone is involved in aromaticity.

In the light of the above statements, choose the correct answer from the options given below:

JEE Main 2023 (Online) 13th April Evening Shift
77

Among the following compounds, the one which shows highest dipole moment is

JEE Main 2023 (Online) 13th April Morning Shift
78

Thin layer chromatography of a mixture shows the following observation:

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Basics of Organic Chemistry Question 101 English

The correct order of elution in the silica gel column chromatography is

JEE Main 2023 (Online) 11th April Morning Shift
79

The decreasing order of hydride affinity for following carbocations is:

JEE Main 2023 (Online) 10th April Evening Shift Chemistry - Basics of Organic Chemistry Question 100 English

Choose the correct answer from the options given below:

JEE Main 2023 (Online) 10th April Evening Shift
80

Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has

JEE Main 2023 (Online) 10th April Morning Shift
81

The correct IUPAC nomenclature for the following compound is:

JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Basics of Organic Chemistry Question 97 English

JEE Main 2023 (Online) 8th April Evening Shift
82

The descending order of acidity for the following carboxylic acid is-

A. $$\mathrm{CH}_{3} \mathrm{COOH}$$

B. $$\mathrm{F}_{3} \mathrm{C}-\mathrm{COOH}$$

C. $$\mathrm{ClCH}_{2}-\mathrm{COOH}$$

D. $$\mathrm{FCH}_{2}-\mathrm{COOH}$$

E. $$\mathrm{BrCH}_{2}-\mathrm{COOH}$$

Choose the correct answer from the options given below:

JEE Main 2023 (Online) 8th April Evening Shift
83

From the figure of column chromatography given below, identify incorrect statements.

JEE Main 2023 (Online) 6th April Evening Shift Chemistry - Basics of Organic Chemistry Question 96 English

A. Compound 'c' is more polar than 'a' and 'b'

B. Compound '$$\mathrm{a}$$' is least polar

C. Compound 'b' comes out of the column before 'c' and after 'a'

D. Compound 'a' spends more time in the column

Choose the correct answer from the options given below:

JEE Main 2023 (Online) 6th April Evening Shift
84

Resonance in carbonate ion $$\left(\mathrm{CO}_{3}{ }^{2-}\right)$$ is

JEE Main 2023 (Online) 1st February Morning Shift Chemistry - Basics of Organic Chemistry Question 114 English

Which of the following is true?

JEE Main 2023 (Online) 1st February Morning Shift
85

Match items of column I and II

Column I (Mixture of compounds) Column II (Separation Technique)
A. $$\mathrm{H_2O/CH_2Cl_2}$$ i. Crystalization
B. JEE Main 2023 (Online) 31st January Morning Shift Chemistry - Basics of Organic Chemistry Question 112 English ii. Differential solvent extraction
C. Kerosene / Naphthalene iii. Column chromatography
D. $$\mathrm{C_6H_{12}O_6/NaCl}$$ iv. Fractional Distillation

Correct match is

JEE Main 2023 (Online) 31st January Morning Shift
86

Match List I with List II:

List I (Mixture) List II (Separation Technique)
A. $\mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$ I. Steam distillation
B. $\mathrm{C}_6 \mathrm{H}_{14}+\mathrm{C}_5 \mathrm{H}_{12}$ II. Differential extraction
C. $\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2+\mathrm{H}_2 \mathrm{O}$ III. Distillation
D. $\text { Organic compound in } \mathrm{H}_2 \mathrm{O}$ IV. Fractional distillation
JEE Main 2023 (Online) 30th January Evening Shift
87

Which of the following conformations will be the most stable?

JEE Main 2023 (Online) 25th January Morning Shift
88

The correct order in aqueous medium of basic strength in case of methyl substituted amines is :

JEE Main 2023 (Online) 25th January Morning Shift
89

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Benzene is more stable than hypothetical cyclohexatriene

Reason R : The delocalised $$\pi$$ electron cloud is attracted more strongly by nuclei of carbon atoms.

In the light of the above statements, choose the correct answer from the options given below:

JEE Main 2023 (Online) 24th January Evening Shift
90

Which will undergo deprotonation most readily in the basic medium?

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Basics of Organic Chemistry Question 106 English

JEE Main 2023 (Online) 24th January Evening Shift
91

Given below are two statements.

Statement I : The compound JEE Main 2022 (Online) 29th July Evening Shift Chemistry - Basics of Organic Chemistry Question 115 English 1 is optically active.

Statement II : JEE Main 2022 (Online) 29th July Evening Shift Chemistry - Basics of Organic Chemistry Question 115 English 2 is mirror image of above compound A.

In the light of the above statement, choose the most appropriate answer from the options given below.

JEE Main 2022 (Online) 29th July Evening Shift
92

Arrange the following in increasing order of reactivity towards nitration

A. p-xylene

B. bromobenzene

C. mesitylene

D. nitrobenzene

E. benzene

Choose the correct answer from the options given below

JEE Main 2022 (Online) 28th July Evening Shift
93

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Thin layer chromatography is an adsorption chromatography.

Reason R : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent.

In the light of the above statements, choose the correct answer from the options given below

JEE Main 2022 (Online) 28th July Evening Shift
94

Match List - I with List - II.

List - I List - II
(A) JEE Main 2022 (Online) 28th July Morning Shift Chemistry - Basics of Organic Chemistry Question 116 English 1 (I) Spiro compound
(B) JEE Main 2022 (Online) 28th July Morning Shift Chemistry - Basics of Organic Chemistry Question 116 English 2 (II) Aromatic compound
(C) JEE Main 2022 (Online) 28th July Morning Shift Chemistry - Basics of Organic Chemistry Question 116 English 3 (III) Non-planar Heterocyclic compound
(D) JEE Main 2022 (Online) 28th July Morning Shift Chemistry - Basics of Organic Chemistry Question 116 English 4 (IV) Bicyclo compound

Choose the correct answer from the options given below :

JEE Main 2022 (Online) 28th July Morning Shift
95

Among the following marked proton of which compound shows lowest $$\mathrm{pK}_{\mathrm{a}}$$ value?

JEE Main 2022 (Online) 28th July Morning Shift
96

Match List - I with List - II.

List - I
(Mixture)
List - II
(Purification Process)
(A) Chloroform & Aniline (I) Steam distillation
(B) Benzoic acid & Napthalene (II) Sublimation
(C) Water & Aniline (III) Distillation
(D) Napthalene & Sodium chloride (IV) Crystallisation

Choose the correct answer from the options given below :

JEE Main 2022 (Online) 27th July Evening Shift
97

Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R.

Assertion A: [6] Annulene, [8] Annulene and cis-[10] Annulene, are respectively aromatic, not-aromatic and aromatic.

JEE Main 2022 (Online) 27th July Morning Shift Chemistry - Basics of Organic Chemistry Question 121 English

Reason R: Planarity is one of the requirements of aromatic systems.

In the light of the above statements, choose the most appropriate answer from the options given below.

JEE Main 2022 (Online) 27th July Morning Shift
98

The correct decreasing order of priority of functional groups in naming an organic Question: compound as per IUPAC system of nomenclature is

JEE Main 2022 (Online) 26th July Evening Shift
99

Which technique among the following, is most appropriate in separation of a mixture of $$100 \,\mathrm{mg}$$ of $$p$$-nitrophenol and picric acid ?

JEE Main 2022 (Online) 26th July Morning Shift
100

Which of the following compounds is not aromatic?

JEE Main 2022 (Online) 26th July Morning Shift
101

Arrange the following in decreasing acidic strength.

JEE Main 2022 (Online) 25th July Evening Shift Chemistry - Basics of Organic Chemistry Question 130 English

JEE Main 2022 (Online) 25th July Evening Shift
102

Which of the following carbocations is most stable?

JEE Main 2022 (Online) 29th June Evening Shift
103

The correct IUPAC name of the following compound is :

JEE Main 2022 (Online) 28th June Evening Shift Chemistry - Basics of Organic Chemistry Question 143 English

JEE Main 2022 (Online) 28th June Evening Shift
104

Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?

JEE Main 2022 (Online) 28th June Morning Shift
105

Which of the following structure are aromatic in nature?

JEE Main 2022 (Online) 28th June Morning Shift Chemistry - Basics of Organic Chemistry Question 141 English

JEE Main 2022 (Online) 28th June Morning Shift
106

Which of the following is most stable?

JEE Main 2022 (Online) 27th June Evening Shift
107

The correct order of nucleophilicity is

JEE Main 2022 (Online) 26th June Evening Shift
108

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene.

Reason R : Benzoic acid is soluble in hot water.

In the light of the above statements, choose the most appropriate answer from the options given below.

JEE Main 2022 (Online) 25th June Evening Shift
109

Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

JEE Main 2022 (Online) 25th June Morning Shift
110

In the following structures, which on is having staggered conformation with maximum dihedral angle?

JEE Main 2022 (Online) 25th June Morning Shift
111

The IUPAC name of ethylidene chloride is :

JEE Main 2022 (Online) 25th June Morning Shift
112

Arrange the following carbocations in decreasing order of stability.

JEE Main 2022 (Online) 24th June Evening Shift Chemistry - Basics of Organic Chemistry Question 133 English

JEE Main 2022 (Online) 24th June Evening Shift
113

Which of the following is an example of conjugated diketone?

JEE Main 2022 (Online) 24th June Morning Shift
114
Arrange the following conformational isomers of n-butane in order of their increasing potential energy :

JEE Main 2021 (Online) 31st August Evening Shift Chemistry - Basics of Organic Chemistry Question 146 English
JEE Main 2021 (Online) 31st August Evening Shift
115
Choose the correct name for compound given below :

JEE Main 2021 (Online) 31st August Morning Shift Chemistry - Basics of Organic Chemistry Question 149 English
JEE Main 2021 (Online) 31st August Morning Shift
116
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) :

Assertion (A) : A simple distillation can be used to separate a mixture of propanol and propanone.

Reason (R) : Two liquids with a difference of more than 20$$^\circ$$ in their boiling points can be separated by simple distillations.

In the light of the above statements, choose the most appropriate answer from the options given below :
JEE Main 2021 (Online) 31st August Morning Shift
117
The compound/s which will show significant intermolecular H-bonding is/are :

JEE Main 2021 (Online) 27th August Evening Shift Chemistry - Basics of Organic Chemistry Question 150 English
JEE Main 2021 (Online) 27th August Evening Shift
118
Which one of the following compounds is not aromatic?
JEE Main 2021 (Online) 26th August Evening Shift
119
The number of stereoisomers possible for 1, 2-dimethyl cyclopropane is :
JEE Main 2021 (Online) 26th August Evening Shift
120
Given below are two statements :

Statement I : Hyperconjugation is a permanent effect.

Statement II : Hyperconjugation in ethyl cation $$\left( {C{H_3} - \mathop C\limits^ + {H_2}} \right)$$ involves the overlapping of $${C_{s{p^2}}} - {H_{1s}}$$ bond with empty 2p orbital of other carbon.

Choose the correct option :
JEE Main 2021 (Online) 27th July Evening Shift
121
Staggered and eclipsed conformers of ethane are :
JEE Main 2021 (Online) 27th July Morning Shift
122
JEE Main 2021 (Online) 27th July Morning Shift Chemistry - Basics of Organic Chemistry Question 155 English
The correct order of stability of given carbocation is :
JEE Main 2021 (Online) 27th July Morning Shift
123
The correct decreasing order of densities of the following compounds is :

JEE Main 2021 (Online) 25th July Evening Shift Chemistry - Basics of Organic Chemistry Question 157 English
JEE Main 2021 (Online) 25th July Evening Shift
124
Which among the following is the strongest acid ?
JEE Main 2021 (Online) 25th July Evening Shift
125
Which one among the following resonating structures is not correct?
JEE Main 2021 (Online) 25th July Morning Shift
126
Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?
JEE Main 2021 (Online) 22th July Evening Shift
127
Which of the following compounds does not exhibit resonance?
JEE Main 2021 (Online) 22th July Evening Shift
128
Which of the following molecules does not show stereo isomerism?
JEE Main 2021 (Online) 22th July Evening Shift
129
Which one of the following pairs of isomers is an example of metamerism?
JEE Main 2021 (Online) 20th July Evening Shift
130
JEE Main 2021 (Online) 20th July Morning Shift Chemistry - Basics of Organic Chemistry Question 166 English
Among the given species the Resonance stabilised carbocations are :
JEE Main 2021 (Online) 20th July Morning Shift
131
In the following molecule,

JEE Main 2021 (Online) 18th March Evening Shift Chemistry - Basics of Organic Chemistry Question 167 English
Hybridisation of Carbon a, b, and c respectively are :
JEE Main 2021 (Online) 18th March Evening Shift
132
Compound with molecular formula C3H6O can show :
JEE Main 2021 (Online) 18th March Morning Shift
133
Nitrogen can be estimated by Kjeldahl's method for which of the following compound?
JEE Main 2021 (Online) 17th March Evening Shift
134
Which of the following is an aromatic compound?
JEE Main 2021 (Online) 17th March Morning Shift
135
Given below are two statements :

Statement I : Retardation factor (Rf) can be measured in meter/centimeter.

Statement II : Rf value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below :
JEE Main 2021 (Online) 17th March Morning Shift
136
In chromotography technique, the purification of compound is independent of :
JEE Main 2021 (Online) 16th March Morning Shift
137
Among the following, the aromatic compounds are :

JEE Main 2021 (Online) 16th March Morning Shift Chemistry - Basics of Organic Chemistry Question 173 English
Choose the correct answer from the following options :
JEE Main 2021 (Online) 16th March Morning Shift
138
Given below are two statements :

Statement I : A mixture of chloroform and aniline can be separated by simple distillation.

Statement II : When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point.

In the light of the above statements, choose the most appropriate answer from the options given below :
JEE Main 2021 (Online) 26th February Morning Shift
139
The correct order of acid character of the following compounds is :

JEE Main 2021 (Online) 25th February Evening Shift Chemistry - Basics of Organic Chemistry Question 175 English
JEE Main 2021 (Online) 25th February Evening Shift
140
Which one of the following compounds is non-aromatic?
JEE Main 2021 (Online) 24th February Evening Shift
141
The IUPAC name of the following compound is : JEE Main 2020 (Online) 6th September Evening Slot Chemistry - Basics of Organic Chemistry Question 178 English
JEE Main 2020 (Online) 6th September Evening Slot
142
Which of the following compounds shows geometrical isomerism?
JEE Main 2020 (Online) 6th September Morning Slot
143
The increasing order of boiling points of the following compounds is : JEE Main 2020 (Online) 5th September Evening Slot Chemistry - Basics of Organic Chemistry Question 180 English
JEE Main 2020 (Online) 5th September Evening Slot
144
The IUPAC name of the following compound is : JEE Main 2020 (Online) 4th September Morning Slot Chemistry - Basics of Organic Chemistry Question 182 English
JEE Main 2020 (Online) 4th September Morning Slot
145
Glycerol is separated in soap industries by :
JEE Main 2020 (Online) 3rd September Morning Slot
146
Which one of the following compounds possesses the most acidic hydrogen?
JEE Main 2020 (Online) 3rd September Morning Slot
147
The IUPAC name for the following compound is JEE Main 2020 (Online) 2nd September Morning Slot Chemistry - Basics of Organic Chemistry Question 186 English
JEE Main 2020 (Online) 2nd September Morning Slot
148
Which of the following has the shortest C-Cl bond?
JEE Main 2020 (Online) 9th January Evening Slot
149
The increasing order of basicity for the following intermediates is (from weak to strong)
JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 188 English 1 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 188 English 2 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 188 English 3 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 188 English 4 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 188 English 5
JEE Main 2020 (Online) 9th January Morning Slot
150
Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?
JEE Main 2020 (Online) 8th January Evening Slot
151
A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63oC while the other boils at 60oC What is the best way to separate the two liquids and which one will be distilled out first ?
JEE Main 2020 (Online) 8th January Morning Slot
152
A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethylacelate (20:80), the sequence of obtained compounds is :
JEE Main 2020 (Online) 7th January Evening Slot
153
The increasing order to Pkb for the following compounds will be : JEE Main 2020 (Online) 7th January Morning Slot Chemistry - Basics of Organic Chemistry Question 192 English
JEE Main 2020 (Online) 7th January Morning Slot
154
The IUPAC name for the following compound is : JEE Main 2019 (Online) 12th April Evening Slot Chemistry - Basics of Organic Chemistry Question 193 English
JEE Main 2019 (Online) 12th April Evening Slot
155
The increasing order of the pKb of the following compound is : JEE Main 2019 (Online) 12th April Morning Slot Chemistry - Basics of Organic Chemistry Question 194 English
JEE Main 2019 (Online) 12th April Morning Slot
156
The increasing order of nucleophilicity of the following nucleophiles is :
(a) CH3CO2$$-$$           (b) H2O
(c) CH3SO3$$-$$           (d) $$\mathop O\limits^ - H$$
JEE Main 2019 (Online) 10th April Evening Slot
157
Which of these factors does not govern the stability of a conformation in acyclic compounds?
JEE Main 2019 (Online) 10th April Evening Slot
158
In chromatography, which of the following statements is incorrect for Rf ?
JEE Main 2019 (Online) 10th April Evening Slot
159
The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is : JEE Main 2019 (Online) 10th April Morning Slot Chemistry - Basics of Organic Chemistry Question 198 English
JEE Main 2019 (Online) 10th April Morning Slot
160
The principle of column chromatography is :
JEE Main 2019 (Online) 10th April Morning Slot
161
The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is : JEE Main 2019 (Online) 9th April Morning Slot Chemistry - Basics of Organic Chemistry Question 200 English
JEE Main 2019 (Online) 9th April Morning Slot
162
The correct IUPAC name of the following compound is : JEE Main 2019 (Online) 9th April Morning Slot Chemistry - Basics of Organic Chemistry Question 201 English
JEE Main 2019 (Online) 9th April Morning Slot
163
Which of the following compounds will show the maximum 'enol' content?
JEE Main 2019 (Online) 8th April Evening Slot
164
In the following compounds, the decreasing order of basic strength will be :
JEE Main 2019 (Online) 8th April Morning Slot
165
The IUPAC name of the following compound is :
JEE Main 2019 (Online) 8th April Morning Slot Chemistry - Basics of Organic Chemistry Question 204 English
JEE Main 2019 (Online) 8th April Morning Slot
166
Among the following four aromatic compounds, which one will have the lowest melting point ?
JEE Main 2019 (Online) 12th January Morning Slot
167
In the following compound,

JEE Main 2019 (Online) 11th January Evening Slot Chemistry - Basics of Organic Chemistry Question 206 English

the favourable site/s for protonation is/are :
JEE Main 2019 (Online) 11th January Evening Slot
168
The correct match between items I and II is :

Item-I (Mixture) Item-II (Seperation method)
(A) H2O : Sugar (P) Sublimation
(B) H2O : Aniline (Q) Recrystallization
(C) H2O : Toluene
(R) Steam distillation
(S) Differential extraction
JEE Main 2019 (Online) 11th January Morning Slot
169
What is the IUPAC name of the following compound ?

JEE Main 2019 (Online) 10th January Evening Slot Chemistry - Basics of Organic Chemistry Question 208 English
JEE Main 2019 (Online) 10th January Evening Slot
170
If dichloromethane (DCM) and water (H2O) are used for differential extraction, which one of the following statements is correct ?
JEE Main 2019 (Online) 10th January Morning Slot
171
Which of the following compounds is not aromatic ?
JEE Main 2019 (Online) 9th January Evening Slot
172
The increasing basicity order of the following compounds is :
JEE Main 2019 (Online) 9th January Evening Slot Chemistry - Basics of Organic Chemistry Question 210 English
JEE Main 2019 (Online) 9th January Evening Slot
173
Which amongst the following is the strongest acid ?
JEE Main 2019 (Online) 9th January Morning Slot
174
The correct decreasing order for acid strength is :
JEE Main 2019 (Online) 9th January Morning Slot
175
On treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is :
JEE Main 2018 (Online) 15th April Evening Slot Chemistry - Basics of Organic Chemistry Question 221 English
JEE Main 2018 (Online) 15th April Evening Slot
176
Two compounds I and II are eluted by column chromatography (adsorption of I > II). Which one of following is a correct statement ?
JEE Main 2018 (Online) 15th April Evening Slot
177
The IUPAC name of the following compound is :

JEE Main 2018 (Online) 15th April Morning Slot Chemistry - Basics of Organic Chemistry Question 224 English
JEE Main 2018 (Online) 15th April Morning Slot
178
The correct match between items of List-I and List-II is :

List - I List - II
(A) Coloured impurity (P) Steam distilation
(B) Mixture of o-nitrophenol
and p-nitrophenol
(Q) Fractional distilation
(C) Crude Naphtha (R) Charcoal treatment
(d) Mixture of glycerol
and sugars
(S) Distillation under
reduced pressure
JEE Main 2018 (Online) 15th April Morning Slot
179
Which of the following compounds will show highest dipole moment ?

JEE Main 2017 (Online) 9th April Morning Slot Chemistry - Basics of Organic Chemistry Question 215 English
JEE Main 2017 (Online) 9th April Morning Slot
180
In the following structure, the double bonds are marked as I, II, III and IV

JEE Main 2017 (Online) 9th April Morning Slot Chemistry - Basics of Organic Chemistry Question 216 English

Geometrical isomerism is not possible at site (s) :
JEE Main 2017 (Online) 9th April Morning Slot
181
Which of the following compounds is most reactive to an aqueous solution of sodium carbonate ?
JEE Main 2017 (Online) 9th April Morning Slot
182
Which of the following statements is not true about partition chromatography?
JEE Main 2017 (Online) 8th April Morning Slot
183
A mixture containing the following four compounds is extracted with $$1M$$ $$HCl.$$ The compound that goes to aqueous layer is :

JEE Main 2017 (Online) 8th April Morning Slot Chemistry - Basics of Organic Chemistry Question 219 English
JEE Main 2017 (Online) 8th April Morning Slot
184
The IUPAC name of the following compound is :

JEE Main 2017 (Online) 8th April Morning Slot Chemistry - Basics of Organic Chemistry Question 218 English
JEE Main 2017 (Online) 8th April Morning Slot
185
Which of the following molecules is least resonance stabilized?
JEE Main 2017 (Offline)
186
The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :
JEE Main 2016 (Online) 9th April Morning Slot
187
The absolute configuration of

JEE Main 2016 (Offline) Chemistry - Basics of Organic Chemistry Question 230 English

is :
JEE Main 2016 (Offline)
188
The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :
JEE Main 2016 (Offline)
189
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is: (at. Mass Ag = 108; Br = 80)
JEE Main 2015 (Offline)
190
Which of the following compounds will exhibit geometrical isomerism?
JEE Main 2015 (Offline)
191
For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 ml of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:
JEE Main 2014 (Offline)
192
The order of stability of the following carbocations :

JEE Main 2013 (Offline) Chemistry - Basics of Organic Chemistry Question 229 English
JEE Main 2013 (Offline)
193
Identify the compound that exhibits tautomerism.
AIEEE 2011
194
The correct order of increasing basicity of the given conjugate bases (R = CH3) is
AIEEE 2010
195
Out of the following, the alkene that exhibits optical isomerism is
AIEEE 2010
196
The number of stereoisomers possible for a compound of the molecular formula CH3 - CH = CH - CH(OH) - Me is :
AIEEE 2009
197
The alkene that exhibits geometrical isomerism is :
AIEEE 2009
198
The IUPAC name of neopentane is
AIEEE 2009
199
Arrange the carbanions, $${(C{H_3})_3}\overline C $$, $$\overline C C{l_3}$$ , $${(C{H_3})_2}\overline C H$$, $${C_6}{H_5}\overline C H{}_2$$ in order of their decreasing stability :
AIEEE 2009
200
The absolute configuration of

AIEEE 2008 Chemistry - Basics of Organic Chemistry Question 227 English
AIEEE 2008
201
The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
AIEEE 2008
202
The electrophile, $${E^ \oplus }$$ attacks the benzene ring to generate the intermediate $$\sigma - $$complex. Of the following, which $$\sigma - $$complex is lowest energy?
AIEEE 2008
203
Which of the following molecules is expected to rotate the plane of plane - polarized light?
AIEEE 2007
204
AIEEE 2007 Chemistry - Basics of Organic Chemistry Question 225 English
AIEEE 2007
205
Which one of the following conformation of cyclohexane is chiral?
AIEEE 2007
206
Presence of a nitro group in a benzene ring
AIEEE 2007
207
The $$IUPAC$$ name of the compound shown below is :

AIEEE 2006 Chemistry - Basics of Organic Chemistry Question 231 English
AIEEE 2006
208
CH3Br + Nu- $$\to$$ CH3 - Nu + Br- The decreasing order of the rate of the above reaction with nucleophiles (Nu) A to D is
[Nu = (A) PhO, (B) AcO, (C) HO–, (D) CH3O]
AIEEE 2006
209
Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is
AIEEE 2006
210
The increasing order of stability of the following free radicals is
AIEEE 2006
211
The reaction

AIEEE 2005 Chemistry - Basics of Organic Chemistry Question 232 English

is fastest when $$X$$ is
AIEEE 2005
212
Due to the presence of an unpaired electron, free radicals are:
AIEEE 2005
213
The decreasing order of nucleophilicity among the nucleophiles

AIEEE 2005 Chemistry - Basics of Organic Chemistry Question 239 English
AIEEE 2005
214
Which of the following compound is not chiral?
AIEEE 2004
215
Which of the following is the strongest base ?
AIEEE 2004
216
Amongst the following compounds, the optically active alkane having lowest molecular mass is
AIEEE 2004
217
Rate of the reaction

AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 236 English

is fastest when $$Z$$ is
AIEEE 2004
218
Which of the following will have meso-isomer also?
AIEEE 2004
219
The $$IUPAC$$ name of the compound is

AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 235 English
AIEEE 2004
220
Consider the acidity of the carboxylic acids:
(a) PhCOOH
(b) o – NO2C6H4COOH
(c) p – NO2C6H4COOH
(d) m – NO2C6H4COOH
Which of the following order is correct?
AIEEE 2004
221
Which one the following does not have sp2 hybridized carbon?
AIEEE 2004
222
In the anion HCOO$$-$$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
AIEEE 2003
223
Among the following four structures $$i$$ to $$iv,$$

AIEEE 2003 Chemistry - Basics of Organic Chemistry Question 234 English

it is true that
AIEEE 2003
224
The IUPAC name of CH3COCH(CH3)2 is
AIEEE 2003
225
The general formula CnH2nO2 could be for open chain
AIEEE 2003
226
A similarity between optical and geometrical isomerism is that
AIEEE 2002
227
Which of the following does not show geometrical isomerism?
AIEEE 2002
228
Following types of compounds (as $$I, II$$ )

AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 233 English

are studied in terms of isomerism in :
AIEEE 2002
229
Which of the following compounds has wrong $$IUPAC$$ name ?
AIEEE 2002
230
Racemic mixture is formed by mixing two
AIEEE 2002
231
Arrangement of (CH3)3C-, (CH3)2CH-, CH3-CH2- when attached to benzyl or an unsaturated group in increasing order of inductive effect is
AIEEE 2002

Numerical

1

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula $\mathrm{C}_9 \mathrm{H}_{12}$ is________.

JEE Main 2025 (Online) 3rd April Evening Shift
2

The hydrocarbon $(\mathrm{X})$ with molar mass $80 \mathrm{~g} \mathrm{~mol}^{-1}$ and $90 \%$ carbon has _______ degree of unsaturation.

JEE Main 2025 (Online) 24th January Evening Shift
3

The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is ________.

JEE Main 2025 (Online) 24th January Evening Shift
4

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl . The percentage composition of chlorine in the compound is _________ %. (Given : molar mass in $\mathrm{g} \mathrm{~mol}^{-1}$ of $\mathrm{Ag}: 108, \mathrm{Cl}: 35.5$ )

JEE Main 2025 (Online) 22nd January Morning Shift
5

How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects?

JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Basics of Organic Chemistry Question 58 English

JEE Main 2024 (Online) 9th April Morning Shift
6

Total number of aromatic compounds among the following compounds is ______.

JEE Main 2024 (Online) 8th April Evening Shift Chemistry - Basics of Organic Chemistry Question 48 English

JEE Main 2024 (Online) 8th April Evening Shift
7

The number of optically active compounds from the following is _________.

JEE Main 2024 (Online) 8th April Evening Shift Chemistry - Basics of Organic Chemistry Question 46 English

JEE Main 2024 (Online) 8th April Evening Shift
8

The number of optical isomers in following compound is : __________.

JEE Main 2024 (Online) 8th April Morning Shift Chemistry - Basics of Organic Chemistry Question 44 English

JEE Main 2024 (Online) 8th April Morning Shift
9

Number of carbocations from the following that are not stabilized by hyperconjugation is _______.

JEE Main 2024 (Online) 6th April Evening Shift Chemistry - Basics of Organic Chemistry Question 37 English

JEE Main 2024 (Online) 6th April Evening Shift
10

Using the given figure, the ratio of $$\mathrm{R}_f$$ values of sample $$\mathrm{A}$$ and sample $$\mathrm{C}$$ is $$x \times 10^{-2}$$. Value of $$x$$ is __________.

JEE Main 2024 (Online) 5th April Evening Shift Chemistry - Basics of Organic Chemistry Question 39 English

JEE Main 2024 (Online) 5th April Evening Shift
11

The total number of 'sigma' and 'pi' bonds in 2-oxohex-4-ynoic acid is ______.

JEE Main 2024 (Online) 4th April Evening Shift
12

The number of different chain isomers for C$$_7$$H$$_{16}$$ is __________.

JEE Main 2024 (Online) 4th April Morning Shift
13
Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is _______ .
JEE Main 2024 (Online) 1st February Evening Shift
14
Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is _______ .

JEE Main 2024 (Online) 1st February Morning Shift Chemistry - Basics of Organic Chemistry Question 89 English
JEE Main 2024 (Online) 1st February Morning Shift
15
Number of optical isomers possible for 2-chlorobutane ________.
JEE Main 2024 (Online) 1st February Morning Shift
16

Number of isomeric products formed by monochlorination of 2-methylbutane in presence of sunlight is ________.

JEE Main 2024 (Online) 31st January Evening Shift
17

Number of geometrical isomers possible for the given structure is/are _________.

JEE Main 2024 (Online) 30th January Evening Shift Chemistry - Basics of Organic Chemistry Question 64 English

JEE Main 2024 (Online) 30th January Evening Shift
18

Total number of compounds with Chiral carbon atoms from following is _________.

JEE Main 2024 (Online) 27th January Evening Shift Chemistry - Basics of Organic Chemistry Question 79 English

JEE Main 2024 (Online) 27th January Evening Shift
19

3-Methylhex-2-ene on reaction with $$\mathrm{HBr}$$ in presence of peroxide forms an addition product (A). The number of possible stereoisomers for '$$\mathrm{A}$$' is ________.

JEE Main 2024 (Online) 27th January Morning Shift
20

Among the given organic compounds, the total number of aromatic compounds is

JEE Main 2024 (Online) 27th January Morning Shift Chemistry - Basics of Organic Chemistry Question 83 English

JEE Main 2024 (Online) 27th January Morning Shift
21

Among the following, total number of meta directing functional groups is (Integer based)

$$-\mathrm{OCH}_3,-\mathrm{NO}_2,-\mathrm{CN},-\mathrm{CH}_3-\mathrm{NHCOCH}_3, -\mathrm{COR},-\mathrm{OH},-\mathrm{COOH},-\mathrm{Cl}$$

JEE Main 2024 (Online) 27th January Morning Shift
22

Three organic compounds A, B and $$\mathrm{C}$$ were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The $$\mathrm{R}_{\mathrm{f}}$$ value of the most polar compound is ____________ $$\times 10^{-2}$$

JEE Main 2023 (Online) 12th April Morning Shift Chemistry - Basics of Organic Chemistry Question 102 English

JEE Main 2023 (Online) 12th April Morning Shift
23

The total number of chiral compound/s from the following is ______________.

JEE Main 2023 (Online) 1st February Morning Shift Chemistry - Basics of Organic Chemistry Question 113 English

JEE Main 2023 (Online) 1st February Morning Shift
24

Following chromatogram was developed by adsorption of compound 'A' on a 6 cm TLC glass plate. Retardation factor of the compound 'A' is _________ $$\times 10^{-1}$$.

JEE Main 2023 (Online) 29th January Morning Shift Chemistry - Basics of Organic Chemistry Question 110 English

JEE Main 2023 (Online) 29th January Morning Shift
25

Optical activity of an enantiomeric mixture is $$+12.6^{\circ}$$ and the specific rotation of $$(+)$$ isomer is $$+30^{\circ}$$. The optical purity is __________$$\%$$.

JEE Main 2022 (Online) 27th July Morning Shift
26

Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is ___________.

JEE Main 2022 (Online) 26th July Evening Shift
27

The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are 3.25 cm, 2.08 cm and 1.05 cm, respectively. The ratio of Rf values of A to B is _____________.

JEE Main 2022 (Online) 25th July Evening Shift
28

The total number of monobromo derivatives formed by the alkanes with molecular formula C5H12 is (excluding stereo isomers) __________.

JEE Main 2022 (Online) 25th July Evening Shift
29

Observe structures of the following compounds

JEE Main 2022 (Online) 29th June Morning Shift Chemistry - Basics of Organic Chemistry Question 145 English

The total number of structures/compounds which possess asymmetric carbon atoms is ______________.

JEE Main 2022 (Online) 29th June Morning Shift
30

Total number of possible stereoisomers of dimethyl cyclopentane is ____________.

JEE Main 2022 (Online) 27th June Morning Shift
31

Number of electrophilic centres in the given compound is _______________.

JEE Main 2022 (Online) 24th June Morning Shift Chemistry - Basics of Organic Chemistry Question 132 English

JEE Main 2022 (Online) 24th June Morning Shift
32
The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is ___________ degree. (Round off to the nearest integer)
JEE Main 2021 (Online) 27th July Evening Shift
33
The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________
JEE Main 2021 (Online) 22th July Evening Shift
34
When 0.15 g of an organic compound was analyzed using Carius method for estimation of bromine, 0.2397 g of AgBr was obtained. The percentage of bromine in the organic compound is ______________. (Nearest integer)

[Atomic mass : Silver = 108, Bromine = 80]
JEE Main 2021 (Online) 20th July Evening Shift
35
Using the provided information in the following paper chromatogram :

JEE Main 2021 (Online) 25th February Morning Shift Chemistry - Basics of Organic Chemistry Question 176 English
Fig : Paper chromatography for compounds A and B.

the calculated Rf value of A ________$$\times$$ 10-1.
JEE Main 2021 (Online) 25th February Morning Shift
36
The number of chiral carbons present in the molecule given below is _____ . JEE Main 2020 (Online) 2nd September Morning Slot Chemistry - Basics of Organic Chemistry Question 185 English
JEE Main 2020 (Online) 2nd September Morning Slot

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