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Basics of Organic Chemistry

297 Questions Start JEE Mains Test
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2017 Q251 JEE Mains MCQ
14 Mar 2026
Which of the following molecules is least resonance stabilized?
A.
JEE Main 2017 (Offline) Chemistry - Basics of Organic Chemistry Question 268 English Option 1
B.
JEE Main 2017 (Offline) Chemistry - Basics of Organic Chemistry Question 268 English Option 2
C.
JEE Main 2017 (Offline) Chemistry - Basics of Organic Chemistry Question 268 English Option 3
D.
JEE Main 2017 (Offline) Chemistry - Basics of Organic Chemistry Question 268 English Option 4
2016 Q252 JEE Mains MCQ
14 Mar 2026
The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :
A.
2, 2-dimethyl-4-pentene
B.
Isopropyl-2-butene
C.
4, 4-dimethylpentene
D.
2, 2-dimethyl-3-pentene
2016 Q253 JEE Mains MCQ
14 Mar 2026
The absolute configuration of

JEE Main 2016 (Offline) Chemistry - Basics of Organic Chemistry Question 257 English

is :
A.
$(2S, 3S)$
B.
$(2R, 3R)$
C.
$(2R, 3S)$
D.
$(2S, 3R)$
2016 Q254 JEE Mains MCQ
14 Mar 2026
The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :
A.
Simple distillation
B.
Fractional distillation
C.
Steam distillation
D.
Distillation under reduced pressure
2015 Q255 JEE Mains MCQ
14 Mar 2026
Which of the following compounds will exhibit geometrical isomerism?
A.
3-Phenyl-1-butene
B.
2-Phenyl-1-butene
C.
1,1-Diphenyl-1-propane
D.
1-Phenyl-2-butene
2015 Q256 JEE Mains MCQ
14 Mar 2026
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)
A.
48
B.
60
C.
36
D.
24
2014 Q257 JEE Mains MCQ
14 Mar 2026
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:
A.
3%
B.
5%
C.
6%
D.
10%
2013 Q258 JEE Mains MCQ
14 Mar 2026
The order of stability of the following carbocations :

JEE Main 2013 (Offline) Chemistry - Basics of Organic Chemistry Question 256 English
A.
${\rm I}{\rm I}{\rm I} > {\rm I}{\rm I} > {\rm I}$
B.
${\rm I}{\rm I} > {\rm I}{\rm I}{\rm I} > {\rm I}$
C.
${\rm I} > {\rm I}{\rm I} > {\rm I}{\rm I}{\rm I}$
D.
${\rm I}{\rm I}{\rm I} > {\rm I} > {\rm I}{\rm I}$
2011 Q259 JEE Mains MCQ
14 Mar 2026
Identify the compound that exhibits tautomerism.
A.
Lactic acid
B.
2-Pentanone
C.
Pheno
D.
2- Butene
2010 Q260 JEE Mains MCQ
14 Mar 2026
Out of the following, the alkene that exhibits optical isomerism is
A.
3–methyl–2–pentene
B.
4–methyl–1–pentene
C.
3–methyl–1–pentene
D.
2–methyl–2–pentene
2010 Q261 JEE Mains MCQ
14 Mar 2026
The correct order of increasing basicity of the given conjugate bases (R = CH3) is
A.
$RCO\overline O$ < HC = $\overline C$ < $\overline R$ < $\overline NH_2$
B.
$\overline R$ < HC = $\overline C$ < $RCO\overline O$ < $\overline NH_2$
C.
$RCO\overline O$ < $\overline NH_2$ < HC = $\overline C$ < $\overline R$
D.
$RCO\overline O$ < HC = $\overline C$ < $\overline NH_2$ < $\overline R$
2009 Q262 JEE Mains MCQ
14 Mar 2026
The number of stereoisomers possible for a compound of the molecular formula CH3 - CH = CH - CH(OH) - Me is :
A.
2
B.
4
C.
6
D.
3
2009 Q263 JEE Mains MCQ
14 Mar 2026
The alkene that exhibits geometrical isomerism is :
A.
propene
B.
2-methyl propene
C.
2-butene
D.
2- methyl -2- butene
2009 Q264 JEE Mains MCQ
14 Mar 2026
The IUPAC name of neopentane is
A.
2-methylbutane
B.
2, 2-dimethylpropane
C.
2-methylpropane
D.
2,2-dimethylbutane
2009 Q265 JEE Mains MCQ
14 Mar 2026
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 :
A.
${(C{H_3})_2}\overline C H$ > $\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_3}\overline C $
B.
$\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_2}\overline C H$ > ${(C{H_3})_3}\overline C $
C.
${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$ > ${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$
D.
${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$ > ${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$
2008 Q266 JEE Mains MCQ
14 Mar 2026
The absolute configuration of

AIEEE 2008 Chemistry - Basics of Organic Chemistry Question 254 English
A.
$S,S$
B.
$R,R$
C.
$R,S$
D.
$S,R$
2008 Q267 JEE Mains MCQ
14 Mar 2026
The electrophile, ${E^ \oplus }$ attacks the benzene ring to generate the intermediate $\sigma - $complex. Of the following, which $\sigma - $complex is lowest energy?
A.
AIEEE 2008 Chemistry - Basics of Organic Chemistry Question 255 English Option 1
B.
AIEEE 2008 Chemistry - Basics of Organic Chemistry Question 255 English Option 2
C.
AIEEE 2008 Chemistry - Basics of Organic Chemistry Question 255 English Option 3
D.
AIEEE 2008 Chemistry - Basics of Organic Chemistry Question 255 English Option 4
2008 Q268 JEE Mains MCQ
14 Mar 2026
The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
A.
−COOH, −SO3H, −CONH2, −CHO
B.
−SO3H, −COOH, −CONH2, −CHO
C.
−CHO, −COOH, −SO3H, −CONH2
D.
−CONH2, −CHO, −SO3H, −COOH
2007 Q269 JEE Mains MCQ
14 Mar 2026
Presence of a nitro group in a benzene ring
A.
activates the ring towards electrophilic substitution
B.
renders the ring basic
C.
deactivates the ring towards nucleophilic substitution
D.
deactivates the ring towards electrophilic substitution
2007 Q270 JEE Mains MCQ
14 Mar 2026
Which of the following molecules is expected to rotate the plane of plane - polarized light?
A.
AIEEE 2007 Chemistry - Basics of Organic Chemistry Question 253 English Option 1
B.
AIEEE 2007 Chemistry - Basics of Organic Chemistry Question 253 English Option 2
C.
AIEEE 2007 Chemistry - Basics of Organic Chemistry Question 253 English Option 3
D.
AIEEE 2007 Chemistry - Basics of Organic Chemistry Question 253 English Option 4
2007 Q271 JEE Mains MCQ
14 Mar 2026
AIEEE 2007 Chemistry - Basics of Organic Chemistry Question 252 English
A.
$3$ - enthyl - $4$ - $4$ - dimethylheptane
B.
$1,1$ - diethyl - $2,2$ - dimethylpentane
C.
$4, 4$ - dimethyl -$5,5$ - diethylpentane
D.
$5,5$ - diethyl - $4,4$ - dimethylpentane.
2007 Q272 JEE Mains MCQ
14 Mar 2026
Which one of the following conformation of cyclohexane is chiral?
A.
Twist boat
B.
Rigid
C.
Chair
D.
Boat
2006 Q273 JEE Mains MCQ
14 Mar 2026
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–]
A.
A > B > C > D
B.
B > D > C > A
C.
D > C > A > B
D.
D > C > B > A
2006 Q274 JEE Mains MCQ
14 Mar 2026
Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is
A.
Eclipse, Gauche, Anti
B.
Gauche, Eclipse, Anti
C.
Eclipse, Anti, Gauche
D.
Anti, Gauche, Eclipse
2006 Q275 JEE Mains MCQ
14 Mar 2026
The increasing order of stability of the following free radicals is
A.
${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$
B.
${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$
C.
${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$
D.
${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$
2006 Q276 JEE Mains MCQ
14 Mar 2026
The $IUPAC$ name of the compound shown below is :

AIEEE 2006 Chemistry - Basics of Organic Chemistry Question 258 English
A.
$3$-bromo - $1$-chlorocyclohexene
B.
$1$-bromo - $3$-chlorocyclohexene
C.
$2$-bromo - $6$-chlorocyclohex - $1$ -ene
D.
$6$-bromo - $2$ - chlorocyclohexene
2005 Q277 JEE Mains MCQ
14 Mar 2026
The reaction

AIEEE 2005 Chemistry - Basics of Organic Chemistry Question 259 English

is fastest when $X$ is
A.
$OCOR$
B.
$O{C_2}{H_5}$
C.
$N{H_2}$
D.
$Cl$
2005 Q278 JEE Mains MCQ
14 Mar 2026
The decreasing order of nucleophilicity among the nucleophiles

AIEEE 2005 Chemistry - Basics of Organic Chemistry Question 266 English
A.
$\left( C \right),\left( B \right),\left( A \right),\left( D \right)$
B.
$\left( B \right),\left( C \right),\left( A \right),\left( D \right)$
C.
$\left( D \right),\left( C \right),\left( B \right),\left( A \right)$
D.
$\left( A \right),\left( B \right),\left( C \right),\left( D \right)$
2005 Q279 JEE Mains MCQ
14 Mar 2026
Due to the presence of an unpaired electron, free radicals are:
A.
Chemically reactive
B.
Chemically inactive
C.
Anions
D.
Cations
2004 Q280 JEE Mains MCQ
14 Mar 2026
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?
A.
(b) > (d) > (a) > (c)
B.
(b) > (d) > (c) > (a)
C.
(a) > (b) > (c) > (d)
D.
(b) > (c) > (d) > (a)
2004 Q281 JEE Mains MCQ
14 Mar 2026
Which of the following will have meso-isomer also?
A.
2- chlorobutane
B.
2- hydroxyopanoic acid
C.
2,3 – dichloropentane
D.
2-3- dichlorobutane
2004 Q282 JEE Mains MCQ
14 Mar 2026
The $IUPAC$ name of the compound is

AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 262 English
A.
$3,3$-dimethyl - $1$ - cyclohexanol
B.
$1,1$-dimethyl- $3$ -hydroxy cyclohexane
C.
$3,3$-dimethyl- $1$ -hydroxy cyclohexane
D.
$1,1$-dimethyl - $3$ - cyclohexanol
2004 Q283 JEE Mains MCQ
14 Mar 2026
Which of the following is the strongest base ?
A.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 265 English Option 1
B.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 265 English Option 2
C.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 265 English Option 3
D.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 265 English Option 4
2004 Q284 JEE Mains MCQ
14 Mar 2026
Amongst the following compounds, the optically active alkane having lowest molecular mass is
A.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 264 English Option 1
B.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 264 English Option 2
C.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 264 English Option 3
D.
AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 264 English Option 4
2004 Q285 JEE Mains MCQ
14 Mar 2026
Rate of the reaction

AIEEE 2004 Chemistry - Basics of Organic Chemistry Question 263 English

is fastest when $Z$ is
A.
$O{C_2}{H_5}$
B.
$N{H_2}$
C.
$Cl$
D.
$OCOC{H_3}$
2004 Q286 JEE Mains MCQ
14 Mar 2026
Which one the following does not have sp2 hybridized carbon?
A.
Acetone
B.
Acetamide
C.
Acetonitrile
D.
Acetic acid
2004 Q287 JEE Mains MCQ
14 Mar 2026
Which of the following compound is not chiral?
A.
1- chloropentane
B.
3-chloro-2- methyl pentane
C.
1-chloro -2- methyl pentane
D.
2- chloropentane
2003 Q288 JEE Mains MCQ
14 Mar 2026
Among the following four structures $i$ to $iv,$

AIEEE 2003 Chemistry - Basics of Organic Chemistry Question 261 English

it is true that
A.
only $i$ and $ii$ are chiral compounds
B.
only $iii$ is a chiral compound
C.
only $ii$ and $iv$ are chiral compounds
D.
all four are chiral compounds
2003 Q289 JEE Mains MCQ
14 Mar 2026
The IUPAC name of CH3COCH(CH3)2 is
A.
2-methyl-3-butaone
B.
4-methylisopropyl 1 ketone
C.
3-methyl-2-butaone
D.
Isopropylmethyl ketone
2003 Q290 JEE Mains MCQ
14 Mar 2026
The general formula CnH2nO2 could be for open chain
A.
carboxylic acids
B.
diols
C.
dialdehydes
D.
deketones
2003 Q291 JEE Mains MCQ
14 Mar 2026
In the anion HCOO$-$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
A.
The C = O bond is weaker than the C-O bond
B.
The anion HCOO- has two resonating structures
C.
The anion is obtained by removal of a proton from the acid molecule
D.
Electronic orbitals of carbon atom are hybridised
2002 Q292 JEE Mains MCQ
14 Mar 2026
Racemic mixture is formed by mixing two
A.
isomeric compounds
B.
enantiomers with chiral compounds
C.
meso compounds
D.
optical isomers
2002 Q293 JEE Mains MCQ
14 Mar 2026
Which of the following does not show geometrical isomerism?
A.
1,2-dichloro-1-pentene
B.
1,3-dichloro-2-pentene
C.
1,1-dichloro-1-pentene
D.
1,4-dichloro-2-pentene
2002 Q294 JEE Mains MCQ
14 Mar 2026
Arrangement of (CH3)3C-, (CH3)2CH-, CH3-CH2- when attached to benzyl or an unsaturated group in increasing order of inductive effect is
A.
(CH3)3C- < (CH3)2CH- < CH3-CH2
B.
CH3-CH2- < (CH3)2CH- < (CH3)3C-
C.
(CH3)2CH- < (CH3)3C- < CH3-CH2
D.
(CH3)3C- < CH3-CH2- < CH3)2CH-
2002 Q295 JEE Mains MCQ
14 Mar 2026
Which of the following compounds has wrong $IUPAC$ name ?
A.
AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 267 English Option 1
B.
AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 267 English Option 2
C.
AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 267 English Option 3
D.
AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 267 English Option 4
2002 Q296 JEE Mains MCQ
14 Mar 2026
A similarity between optical and geometrical isomerism is that
A.
each forms equal number of isomers for a given compound
B.
if in a compound one is present then so is the other
C.
both are included in stereoisomerism
D.
they have no similarity
2002 Q297 JEE Mains MCQ
14 Mar 2026
Following types of compounds (as $I, II$ )

AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 260 English

are studied in terms of isomerism in :
A.
chain isomerism
B.
position isomerism
C.
conformers
D.
stereoisomerism