Basics of Organic Chemistry · Chemistry · JEE Main

Given below are two statements :

Statement I : Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.

Statement II : The vapours rising up in the fractionating column become richer in high boiling component of the mixture.

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

$$ \text { The total number of aromatic compounds/species from the following is } $$

Shown below is the structure of methyl acetate with three different $\alpha, \beta$ and $\gamma$ carbon - oxygen bonds.

The correct order of bond lengths of these bonds is :

Given below are two statements :

Statement I : On the basis of inductive effect, the order of stability of alkyl carbanions is $\mathrm{CH}_3{ }^{-}>\mathrm{CH}_3-\mathrm{CH}_2{ }^{-}>\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}>\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{-}$.

Statement II : Allyl and benzyl carbanions are more stabilised by inductive effect and not by resonance effect.

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

$$ \text { Match the LIST-I with LIST-II } $$

Choose the correct answer from the options given below:

$$ \text { Consider the following molecules/species : } $$

$$ \text { The correct order of carbon-oxygen double bond length is : } $$

$$ \text { The following structures are } $$

$$ \text { The descending order of acidity among the following compounds is : } $$

Choose the correct answer from the options given below :

$$ \text { The strongest conjugate acid will result from : } $$

Increasing order of electron withdrawing power of following functional groups is :

a. -CN

b. -COOH

c. $-\mathrm{NO}_2$

d. -I

Given below are two statements :

Statement I : In , the carbocation is stabilised by +R effect of –OCH₃ group.

Statement II : In , the carbanion is stabilised by –R effect of –NO₂ group.

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

In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

For the given molecule, "x", the preferred site for the attack of the electrophile is :

Identify the correct statements :

The presence of –NO₂ group in benzene ring

A. activates the ring towards electrophilic substitutions.

B. deactivates the ring towards electrophilic substitutions.

C. activates the ring towards nucleophilic substitutions.

D. deactivates the ring towards nucleophilic substitutions.

Choose the correct answer from the options given below :

The cyclic cations having the same number of hyperconjugation are :

Choose the correct answer from the options given below :

CORRECT order of stability for the following is

$\mathrm{CH}_2=\mathrm{CH}^{-}, \mathrm{CH}_3-\mathrm{CH}_2^{-}, \mathrm{CH} \equiv \mathrm{C}^{-}$

Given below are two statements :

Statement I : There are several conformers for n -butane. Out of those conformers,

Statement II : As the dihedral angle increases, torsional strain decreases from (X) to $(\mathrm{Y})$.

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

Find out the statements which are not true.

A. Resonating structures with more number of covalent bonds and lesser charge separation are more stable.

B. In electromeric effect, an unsaturated system shows +E effect with nucleophile and -E effect with electrophile.

C. Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds.

D. The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.

E. Stability of carbanion increases with the increase in $\mathrm{s}-$ character of the carbon carrying the negative charge.

Choose the correct answer from the options given below :

$$ \text { Arrange the following carbanions in the decreasing order of stability. } $$

Choose the correct answer from the options given below :

Given below are two statements :

Statement I : $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$ is more stable than $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3$ as nine hyperconjugation interactions are possible in $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$.

Statement II : $\stackrel{\oplus}{\mathrm{C}}\mathrm{H}_3$ is less stable than $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$ as only three hyperconjugation interactions are possible in $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3$.

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

Given below are two statements :

Statement I : Sublimation is used for the separation and purification of compounds with low melting point.

Statement II : The boiling point of a liquid increases as the external pressure is reduced. In the light of the above statements,

choose the correct answer from the options given below :

$$ \text { The IUPAC name of the following compound is : } $$

Match List - I with List - II.

Choose the correct answer from the options given below :

Given below are four compounds :

(a) n-propyl chloride       (b) iso-propyl chloride

(c) sec-butyl chloride      (d) neo-pentyl chloride

Percentage of carbon in the one which exhibits optical isomerism is :

$$ \text { From the following, the least stable structure is : } $$

Identify correct statements from the following :

A. Propanal and propanone are functional isomers.

B. Ethoxyethane and methoxypropane are metamers.

C. But-2-ene shows optical isomerism.

D. But-1-ene and but-2-ene are functional isomers.

E. Pentane and 2, 2-dimethyl propane are chain isomers.

Choose the correct answer from the options given below :

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

What is the correct IUPAC name of the compound?

The descending order of basicity of the following amines is :

(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 :

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

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

The IUPAC name of the following compound is:

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

The correct order of basicity for the following molecules is :

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

?

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 Cation, 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

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

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

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

Consider the following compound (X)

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

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

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 :

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 :

Match List - I with List - II.

List - I (Structure)	List - II (IUPAC Name)
(A)	(I) 4-Methylpent-1-ene
(B) (CH3)2C(C3H7)2	(II) 3-Ethyl-5-methylheptane
(C)	(III) 4,4-Dimethylheptane
(D)	(IV) 2-Methyl-1,3-pentadiene

Choose the correct answer from the options given below :

Total number of nucleophiles from the following is :

Given below are two statements:

Statement I: and are isomeric compounds.

Statement II: and are functional group isomers.

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

The correct order of stability of following carbocations is :

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

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 :

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

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

The most stable carbocation from the following is :

How many different stereoisomers are possible for the given molecule?

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 :

The IUPAC name of the following compound is :

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

Total number of stereo isomers possible for the given structure :

Relative stability of the contributing structures is :

Correct order of basic strength of Pyrrole , Pyridine and Piperidine is :

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

Choose the correct answer from the options given below :

Methods used for purification of organic compounds are based on :

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

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

IUPAC name of following hydrocarbon(X) is :

Which of the following are aromatic?

Given below are two statements :

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

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

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

Functional group present in sulphonic acids is :

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

The correct nomenclature for the following compound is :

Match List - I with List - II.

Choose the correct answer from the options given below :

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 :

Correct order of stability of carbanion is :

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

Match List I with List II :

	LIST I Mechanism steps		LIST II Effect
A.		I.	$$-$$ E effect
B.		II.	$$-$$ R effect
C.		III.	$$+$$ E effect
D.		IV.	$$+$$ R effect

Choose the correct answer from the options given below :

Which among the following is incorrect statement?

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

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

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

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:

The correct stability order of carbocations is

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

IUPAC name of following compound is :

Which of the following molecule/species is most stable?

According to IUPAC system, the compound

is named as

The ascending acidity order of the following H atoms is

Which one of the following will show geometrical isomerism?

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

The order of relative stability of the contributing structure is :

Choose the correct answer from the options given below :

The incorrect statement regarding conformations of ethane is :

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

Which of the following is strongest Bronsted base?

Which of the following has highly acidic hydrogen?

Cyclohexene

is ________ type of an organic compound.

IUPAC name of following compound (P) is:

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:

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

Thin layer chromatography of a mixture shows the following observation:

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

The decreasing order of hydride affinity for following carbocations is:

Choose the correct answer from the options given below:

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

The correct IUPAC nomenclature for the following compound is:

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:

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

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:

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

Which of the following is true?

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.		ii.	Differential solvent extraction
C.	Kerosene / Naphthalene	iii.	Column chromatography
D.	$$\mathrm{C_6H_{12}O_6/NaCl}$$	iv.	Fractional Distillation

Correct match is

Match List I with List II:

Which of the following conformations will be the most stable?

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

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:

Which will undergo deprotonation most readily in the basic medium?

Given below are two statements.

Statement I : The compound is optically active.

Statement II : is mirror image of above compound A.

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

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

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

Match List - I with List - II.

	List - I		List - II
(A)		(I)	Spiro compound
(B)		(II)	Aromatic compound
(C)		(III)	Non-planar Heterocyclic compound
(D)		(IV)	Bicyclo compound

Choose the correct answer from the options given below :

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

Match List - I with List - II.

Choose the correct answer from the options given below :

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.

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.

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

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

Which of the following compounds is not aromatic?

Arrange the following in decreasing acidic strength.

Which of the following carbocations is most stable?

The correct IUPAC name of the following compound is :

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

Which of the following structure are aromatic in nature?

Which of the following is most stable?

The correct order of nucleophilicity is

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.

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

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

The IUPAC name of ethylidene chloride is :

Arrange the following carbocations in decreasing order of stability.

Which of the following is an example of conjugated diketone?

0.53 g of an organic compound $(\mathrm{x})$ when heated with excess of nitric acid (concentrated) and then with silver nitrate gave 0.75 g of silver bromide precipitate. 1.0 g of $(\mathrm{x})$ gave 1.32 g of $\mathrm{CO}_2$ gas on combustion. The percentage of hydrogen in the compound $(x)$ is $\_\_\_\_$ %. [Nearest Integer]

[Given: Molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{Br}: 80, \mathrm{Ag}: 108, \mathrm{O}: 16$; Compound (x) : $\left.\mathrm{C}_{\mathrm{x}} \mathrm{H}_{\mathrm{y}} \mathrm{Br}_{\mathrm{z}}\right]$

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

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

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

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 $\mathrm{Ag}: 108, \mathrm{Cl}: 35.5$ )

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

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

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

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

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

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 __________.

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

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

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

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

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

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 ________.

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

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

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

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 ____________ $$\times 10^{-2}$$

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

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

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

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

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 R_f values of A to B is _____________.

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

Observe structures of the following compounds

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

Total number of possible stereoisomers of dimethyl cyclopentane is ____________.

Number of electrophilic centres in the given compound is _______________.

Which of the following is not an example of benzenoid compound?