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JEE Main

Basics of Organic Chemistry

Chemistry

Previous Years Questions

MCQ (Single Correct Answer)

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Among the following marked proton of which compound shows lowest $$\mathrm{pK}_{\mathrm{a}}$$ value?
JEE Main 2022 (Online) 28th July Morning Shift
Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style...
JEE Main 2022 (Online) 28th July Morning Shift
Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R. Assertion A: [6] ...
JEE Main 2022 (Online) 27th July Morning Shift
Which of the following is not an example of benzenoid compound?
JEE Main 2022 (Online) 26th July Evening Shift
The correct decreasing order of priority of functional groups in naming an organic Question: compound as per IUPAC syste...
JEE Main 2022 (Online) 26th July Evening Shift
Which of the following compounds is not aromatic?
JEE Main 2022 (Online) 26th July Morning Shift
Arrange the following in decreasing acidic strength. ...
JEE Main 2022 (Online) 25th July Evening Shift
Which of the following is an example of conjugated diketone?
JEE Main 2022 (Online) 24th June Morning Shift
Arrange the following carbocations in decreasing order of stability. ...
JEE Main 2022 (Online) 24th June Evening Shift
In the following structures, which on is having staggered conformation with maximum dihedral angle?
JEE Main 2022 (Online) 25th June Morning Shift
The correct order of nucleophilicity is
JEE Main 2022 (Online) 26th June Evening Shift
Which of the following is most stable?
JEE Main 2022 (Online) 27th June Evening Shift
Which of the following structure are aromatic in nature? ...
JEE Main 2022 (Online) 28th June Morning Shift
The correct IUPAC name of the following compound is : ...
JEE Main 2022 (Online) 28th June Evening Shift
Which of the following carbocations is most stable?
JEE Main 2022 (Online) 29th June Evening Shift
Arrange the following conformational isomers of n-butane in order of their increasing potential energy :...
JEE Main 2021 (Online) 31st August Evening Shift
Choose the correct name for compound given below :...
JEE Main 2021 (Online) 31st August Morning Shift
The compound/s which will show significant intermolecular H-bonding is/are :...
JEE Main 2021 (Online) 27th August Evening Shift
The number of stereoisomers possible for 1, 2-dimethyl cyclopropane is :
JEE Main 2021 (Online) 26th August Evening Shift
Which one of the following compounds is not aromatic?
JEE Main 2021 (Online) 26th August Evening Shift
Given below are two statements :Statement I : Hyperconjugation is a permanent effect.Statement II : Hyperconjugation in ...
JEE Main 2021 (Online) 27th July Evening Shift
The correct order of stability of given carbocation is :...
JEE Main 2021 (Online) 27th July Morning Shift
Which among the following is the strongest acid ?
JEE Main 2021 (Online) 25th July Evening Shift
The correct decreasing order of densities of the following compounds is :...
JEE Main 2021 (Online) 25th July Evening Shift
Which one among the following resonating structures is not correct?
JEE Main 2021 (Online) 25th July Morning Shift
Which of the following molecules does not show stereo isomerism?
JEE Main 2021 (Online) 22th July Evening Shift
Which of the following compounds does not exhibit resonance?
JEE Main 2021 (Online) 22th July Evening Shift
The correct order of their reactivity towards hydrolysis at room temperature is :...
JEE Main 2021 (Online) 20th July Evening Shift
Which one of the following pairs of isomers is an example of metamerism?
JEE Main 2021 (Online) 20th July Evening Shift
Among the given species the Resonance stabilised carbocations are :...
JEE Main 2021 (Online) 20th July Morning Shift
Given below are two statements :Statement I : C2H5OH and AgCN both can generate nucleophile.Statement II : KCN and AgCN ...
JEE Main 2021 (Online) 18th March Evening Shift
In the following molecule,Hybridisation of Carbon a, b, and c respectively are :...
JEE Main 2021 (Online) 18th March Evening Shift
Compound with molecular formula C3H6O can show :
JEE Main 2021 (Online) 18th March Morning Shift
Which of the following is an aromatic compound?
JEE Main 2021 (Online) 17th March Morning Shift
Which of the following is least basic?
JEE Main 2021 (Online) 16th March Evening Shift
Match List - I with List - II : List - I Test/Reagents/Observation(s) List - II Species detected ...
JEE Main 2021 (Online) 16th March Evening Shift
Among the following, the aromatic compounds are :Choose the correct answer from the following options :...
JEE Main 2021 (Online) 16th March Morning Shift
In $$\mathop C\limits^1 {H_2} = \mathop C\limits^2 = \mathop C\limits^3 H - \mathop C\limits^4 {H_3}$$ molecule, the hy...
JEE Main 2021 (Online) 26th February Evening Shift
Which of the following is 'a' FALSE statement ?
JEE Main 2021 (Online) 26th February Morning Shift
The correct order of acid character of the following compounds is :...
JEE Main 2021 (Online) 25th February Evening Shift
Which one of the following compounds is non-aromatic?
JEE Main 2021 (Online) 24th February Evening Slot
The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :...
JEE Main 2021 (Online) 24th February Evening Slot
The IUPAC name of the following compound is : ...
JEE Main 2020 (Online) 6th September Evening Slot
Which of the following compounds shows geometrical isomerism?
JEE Main 2020 (Online) 6th September Morning Slot
The increasing order of pKb values of the following compounds is : ...
JEE Main 2020 (Online) 6th September Morning Slot
The increasing order of boiling points of the following compounds is : ...
JEE Main 2020 (Online) 5th September Evening Slot
The increasing order of basicity of the following compounds is : ...
JEE Main 2020 (Online) 5th September Morning Slot
Among the following compounds, which one has the shortest C – Cl bond?
JEE Main 2020 (Online) 4th September Evening Slot
The IUPAC name of the following compound is : ...
JEE Main 2020 (Online) 4th September Morning Slot
The decreasing order of reactivity of the following organic molecules towards AgNO3 solution is : ...
JEE Main 2020 (Online) 4th September Morning Slot
The decreasing order of reactivity of the following compounds towards nucleophilic substitution (SN2) is : ...
JEE Main 2020 (Online) 3rd September Evening Slot
The mechanism of SN1 reaction is given as : A student writes general characteristics based on the given mechanism as : ...
JEE Main 2020 (Online) 3rd September Morning Slot
Which one of the following compounds possesses the most acidic hydrogen?
JEE Main 2020 (Online) 3rd September Morning Slot
Consider the reaction sequence given below: Which of the following statements is true?...
JEE Main 2020 (Online) 2nd September Evening Slot
The IUPAC name for the following compound is ...
JEE Main 2020 (Online) 2nd September Morning Slot
Which of the following compunds will show retention in configuration on nucleophilic substitution by OH– ion?
JEE Main 2020 (Online) 2nd September Morning Slot
The reaction of H3N3B3Cl3 (A) with LiBH4 in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) wi...
JEE Main 2020 (Online) 9th January Evening Slot
The decreasing order of basicity of the following amines is : ...
JEE Main 2020 (Online) 9th January Evening Slot
Which of the following has the shortest C-Cl bond?
JEE Main 2020 (Online) 9th January Evening Slot
The increasing order of basicity for the following intermediates is (from weak to strong) ...
JEE Main 2020 (Online) 9th January Morning Slot
The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is : ...
JEE Main 2020 (Online) 8th January Morning Slot
The correct order of stability for the following alkoxides is : ...
JEE Main 2020 (Online) 7th January Evening Slot
The increasing order to Pkb for the following compounds will be : ...
JEE Main 2020 (Online) 7th January Morning Slot
Which one of the following is likely to give a precipitate with AgNO3 solution ?
JEE Main 2019 (Online) 12th April Evening Slot
The IUPAC name for the following compound is : ...
JEE Main 2019 (Online) 12th April Evening Slot
The increasing order of the pKb of the following compound is : ...
JEE Main 2019 (Online) 12th April Morning Slot
An organic compound 'A' is oxidizod with Na2O2 followed by boiling with HNO3. The resultant solution is then treated wit...
JEE Main 2019 (Online) 12th April Morning Slot
The increasing order of nucleophilicity of the following nucleophiles is : (a) CH3CO2$$-$$     &nbsp...
JEE Main 2019 (Online) 10th April Evening Slot
Which of these factors does not govern the stability of a conformation in acyclic compounds?
JEE Main 2019 (Online) 10th April Evening Slot
The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions ...
JEE Main 2019 (Online) 10th April Morning Slot
Increasing rate of SN1 reaction in the following compounds is : ...
JEE Main 2019 (Online) 10th April Morning Slot
Which of the following potential energy (PE) diagrams represents the SN1 reaction?
JEE Main 2019 (Online) 9th April Evening Slot
Increasing order of reactivity of the following compounds for SN1 substitution is: ...
JEE Main 2019 (Online) 9th April Evening Slot
The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is : ...
JEE Main 2019 (Online) 9th April Morning Slot
The correct IUPAC name of the following compound is : ...
JEE Main 2019 (Online) 9th April Morning Slot
Which of the following compounds will show the maximum 'enol' content?
JEE Main 2019 (Online) 8th April Evening Slot
The IUPAC name of the following compound is : ...
JEE Main 2019 (Online) 8th April Morning Slot
In the following compounds, the decreasing order of basic strength will be :
JEE Main 2019 (Online) 8th April Morning Slot
The increasing order of the reactivity of the following with LiAlH4 is ...
JEE Main 2019 (Online) 12th January Evening Slot
The increasing order of reactivity of the following compounds towards reaction with alkyl halides directly is (A) (B)...
JEE Main 2019 (Online) 12th January Morning Slot
Among the following four aromatic compounds, which one will have the lowest melting point ?
JEE Main 2019 (Online) 12th January Morning Slot
In the following compound, the favourable site/s for protonation is/are : ...
JEE Main 2019 (Online) 11th January Evening Slot
A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of CO2 at T = 298.15 K and p ...
JEE Main 2019 (Online) 11th January Morning Slot
What is the IUPAC name of the following compound ? ...
JEE Main 2019 (Online) 10th January Evening Slot
The decreasing order of ease of alkaline hydrolysis for the following esters in ...
JEE Main 2019 (Online) 10th January Morning Slot
The increasing order of the pKa values of the following compounds is : ...
JEE Main 2019 (Online) 10th January Morning Slot
The increasing basicity order of the following compounds is : A B C D ...
JEE Main 2019 (Online) 9th January Evening Slot
Arrange the following amines in the decreasing order of basicity : ...
JEE Main 2019 (Online) 9th January Morning Slot
Which amongst the following is the strongest acid ?
JEE Main 2019 (Online) 9th January Morning Slot
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
Two compounds I and II are eluted by column chromatography (adsorption of I > II). Which one of following is a correc...
JEE Main 2018 (Online) 15th April Evening Slot
The IUPAC name of the following compound is : ...
JEE Main 2018 (Online) 15th April Morning Slot
Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation?
JEE Main 2018 (Offline)
The increasing order of the boiling points for the following compounds is : ...
JEE Main 2017 (Online) 9th April Morning Slot
In the following structure, the double bonds are marked as I, II, III and IV Geometrical isomerism is not possible at s...
JEE Main 2017 (Online) 9th April Morning Slot
Which of the following compounds is most reactive to an aqueous solution of sodium carbonate ?
JEE Main 2017 (Online) 9th April Morning Slot
The IUPAC name of the following compound is : ...
JEE Main 2017 (Online) 8th April Morning Slot
Which of the following statements is not true about partition chromatography ?
JEE Main 2017 (Online) 8th April Morning Slot
A mixture containing the following four compounds is extracted with $$1M$$ $$HCl.$$ The compound that goes to aqueous la...
JEE Main 2017 (Online) 8th April Morning Slot
3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stere...
JEE Main 2017 (Offline)
Which of the following molecules is least resonance stabilized?
JEE Main 2017 (Offline)
The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :
JEE Main 2016 (Online) 9th April Morning Slot
The absolute configuration of is : ...
JEE Main 2016 (Offline)
The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :
JEE Main 2016 (Offline)
Which of the following compounds will exhibit geometrical isomerism?
JEE Main 2015 (Offline)
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine...
JEE Main 2015 (Offline)
For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was ab...
JEE Main 2014 (Offline)
The order of stability of the following carbocations : ...
JEE Main 2013 (Offline)
A solution of (–$$l$$) – chloro –1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5...
JEE Main 2013 (Offline)
Identify the compound that exhibits tautomerism.
AIEEE 2011
29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia w...
AIEEE 2010
The correct order of increasing basicity of the given conjugate bases (R = CH3) is
AIEEE 2010
Out of the following, the alkene that exhibits optical isomerism is
AIEEE 2010
The number of stereoisomers possible for a compound of the molecular formula CH3 - CH = CH - CH(OH) - Me is :
AIEEE 2009
The alkene that exhibits geometrical isomerism is :
AIEEE 2009
The IUPAC name of neopentane is
AIEEE 2009
Arrange the carbanions, $${(C{H_3})_3}\overline C $$, $$\overline C C{l_3}$$ , $${(C{H_3})_2}\overline C H$$, $${C_6}{H...
AIEEE 2009
The absolute configuration of ...
AIEEE 2008
The electrophile, $${E^ \oplus }$$ attacks the benzene ring to generate the intermediate $$\sigma - $$complex. Of the f...
AIEEE 2008
The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclat...
AIEEE 2008
Which of the following molecules is expected to rotate the plane of plane - polarized light?
AIEEE 2007
...
AIEEE 2007
Which one of the following conformation of cyclohexane is chiral?
AIEEE 2007
Presence of a nitro group in a benzene ring
AIEEE 2007
The alkene formed as a major product in the above elimination reaction is ...
AIEEE 2006
The $$IUPAC$$ name of the compound shown below is : ...
AIEEE 2006
Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is
AIEEE 2006
The increasing order of stability of the following free radicals is
AIEEE 2006
CH3Br + Nu- $$\to$$ CH3 - Nu + Br- The decreasing order of the rate of the above reaction with nucleophiles (Nu–) A to D...
AIEEE 2006
The reaction is fastest when $$X$$ is ...
AIEEE 2005
The decreasing order of nucleophilicity among the nucleophiles ...
AIEEE 2005
Due to the presence of an unpaired electron, free radicals are:
AIEEE 2005
The $$IUPAC$$ name of the compound is ...
AIEEE 2004
Rate of the reaction is fastest when $$Z$$ is ...
AIEEE 2004
Amongst the following compounds, the optically active alkane having lowest molecular mass is
AIEEE 2004
Which of the following is the strongest base ?
AIEEE 2004
Which of the following will have meso-isomer also?
AIEEE 2004
Consider the acidity of the carboxylic acids: (a) PhCOOH (b) o – NO2C6H4COOH (c) p – NO2C6H4COOH (d) m – NO2C6H4COOH ...
AIEEE 2004
Which of the following compound is not chiral?
AIEEE 2004
Which one the following does not have sp2 hybridized carbon?
AIEEE 2004
Which one of the following has the minimum boiling point?
AIEEE 2004
Among the following four structures $$i$$ to $$iv,$$ it is true that ...
AIEEE 2003
The general formula CnH2nO2 could be for open chain
AIEEE 2003
In the anion HCOO$$-$$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?...
AIEEE 2003
The IUPAC name of CH3COCH(CH3)2 is
AIEEE 2003
Following types of compounds (as $$I, II$$ ) are studied in terms of isomerism in : ...
AIEEE 2002
Which of the following compounds has wrong $$IUPAC$$ name ?
AIEEE 2002
Racemic mixture is formed by mixing two
AIEEE 2002
The reaction : $${(CH)_3}C - Br\buildrel {{H_2}O} \over \longrightarrow {(CH)_3}C - OH$$
AIEEE 2002
Arrangement of (CH3)3C-, (CH3)2CH-, CH3-CH2- when attached to benzyl or an unsaturated group in increasing order of indu...
AIEEE 2002
Which of the following does not show geometrical isomerism?
AIEEE 2002
A similarity between optical and geometrical isomerism is that
AIEEE 2002

Numerical

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Optical activity of an enantiomeric mixture is $$+12.6^{\circ}$$ and the specific rotation of $$(+)$$ isomer is $$+30^{\...
JEE Main 2022 (Online) 27th July Morning Shift
Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is ___________....
JEE Main 2022 (Online) 26th July Evening Shift
The total number of monobromo derivatives formed by he alkanes with molecular formula C5H12 is (excluding stereo isomers...
JEE Main 2022 (Online) 25th July Evening Shift
The number of sp3 hybridised carbons in an acyclic neutral compound with molecular formula C4H5N is ___________....
JEE Main 2022 (Online) 25th July Morning Shift
Number of electrophilic centres in the given compound is _______________. ...
JEE Main 2022 (Online) 24th June Morning Shift
Total number of possible stereoisomers of dimethyl cyclopentane is ____________.
JEE Main 2022 (Online) 27th June Morning Shift
Observe structures of the following compounds The total number of structures/compounds which possess asymmetric carbon ...
JEE Main 2022 (Online) 29th June Morning Shift
The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is ___________ degree. (Round off ...
JEE Main 2021 (Online) 27th July Evening Shift
The number of sigma bonds in is _______________....
JEE Main 2021 (Online) 25th July Morning Shift
The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________
JEE Main 2021 (Online) 22th July Evening Shift
The number of chiral carbons present in the molecule given below is _____ . ...
JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (More than One Correct Answer)

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Which one of the following compounds is aromatic in nature?
JEE Main 2021 (Online) 1st September Evening Shift
Among the following compounds, geometrical isomerism is exhibited by :
JEE Main 2020 (Online) 5th September Evening Slot

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