Organic Basics (GOC)

23 JEE Main questions · Chemistry

ChemistryJEE Main 21 Jan 2026, Shift 1·Q12·MCQ·Easy–moderate
Open
Stability of resonance structures
From the following, the least stable structure is :
1. (1)
2. (2)
3. (3)
4. (4)
ChemistryJEE Main 21 Jan 2026, Shift 1·Q16·MCQ·Easy–moderate
Open
Structural and stereo isomerism
Identify correct statement 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 :
1. (1)B, C and D only
2. (2)A, B and C only
3. (3)A, B and E only
4. (4)C, D and E only

ChemistryJEE Main 21 Jan 2026, Shift 2·Q2·MCQ·Easy–moderate

Structural and stereo isomerism

Match List-I with List-II.

	List-I (Pair of Compounds)		List-II (Type of Isomers)
A.	2-Methylpropene and but-1-ene	I.	Stereoisomers
B.	Cis-but-2-ene and trans-but-2-ene	II.	Position isomers
C.	2-Butanol and diethyl ether	III.	Chain isomers
D.	But-1-ene and but-2-ene	IV.	Functional group isomers

Choose the correct answer from the options given below:

(1)A-III, B-I, C-IV, D-II
(2)A-III, B-I, C-II, D-IV
(3)A-I, B-IV, C-III, D-II
(4)A-II, B-I, C-IV, D-III

We corrected a printing error in the original paper

Answer corrected; the source key is (2) — 2-butanol and diethyl ether are functional group isomers (C-IV) and but-1-ene and but-2-ene are position isomers (D-II), which is option (1).

ChemistryJEE Main 21 Jan 2026, Shift 2·Q18·MCQ·Moderate
Open
Chirality and hybridisation of carbon
Given below are two statements :
Statement – I : Compound (X), shown below , dissolves in $\ce{NaHCO3}$ solution and has two chiral carbon atoms
Statement – II : Compound (Y), shown below, has two carbons with sp $^3$ hybridization, one carbon with sp $^2$ and one carbon with sp hybridization
In the light of the above statements, choose the correct answer from the options given below :
1. (1)Statement I is true but Statement II is false
2. (2)Statement I is false but Statement II is true
3. (3)Both Statement I and Statement II are true
4. (4)Both Statement I and Statement II are false
ChemistryJEE Main 22 Jan 2026, Shift 2·Q8·MCQ·Easy–moderate
Open
IUPAC nomenclature of esters
The IUPAC name of the following compound is :
1. (1)n-propyl-2-bromo-5-methylheptanoate
2. (2)2-bromo-5-methylhexylpropanoate
3. (3)2-bromo-5-methylpropanoate
4. (4)n-propyl-1-bromo-4-methylhexanoate
We corrected a printing error in the original paper
Source printed “the following comopound”.
ChemistryJEE Main 23 Jan 2026, Shift 2·Q7·MCQ·Easy–moderate
Open
Hyperconjugation and carbocation stability
Given below are two statements:
Statement I: $\mathrm{(CH_3)_3\overset{\oplus}{C}}$ is more stable than $\mathrm{\overset{\oplus}{C}H_3}$ as nine hyperconjugation interactions are possible in $\mathrm{(CH_3)_3\overset{\oplus}{C}}$ .
Statement II: $\mathrm{\overset{\oplus}{C}H_3}$ is less stable than $\mathrm{(CH_3)_3\overset{\oplus}{C}}$ as only three hyperconjugation interactions are possible in $\mathrm{\overset{\oplus}{C}H_3}$ .
In the light of the above statements, choose the correct answer from the options given below.
1. (1)Statement I is true but Statement II is false
2. (2)Both Statement I and Statement II are true
3. (3)Both Statement I and Statement II are false
4. (4)Statement I is false but Statement II is true
ChemistryJEE Main 24 Jan 2026, Shift 1·Q19·MCQ·Moderate
Open
Carbanion stability substituent effects
Arrange the following carbanions in the decreasing order of stability
- (I) $p$ –Br– $\ce{C6H4}$ – $\overset{\ominus}{\ddot{\mathrm{C}}}\mathrm{H_2}$
- (II) $\ce{C6H5}$ – $\overset{\ominus}{\ddot{\mathrm{C}}}\mathrm{H_2}$
- (III) $p$ – $\ce{CH3O}$ – $\ce{C6H4}$ – $\overset{\ominus}{\ddot{\mathrm{C}}}\mathrm{H_2}$
- (IV) $p$ –CHO– $\ce{C6H4}$ – $\overset{\ominus}{\ddot{\mathrm{C}}}\mathrm{H_2}$
- (V) $p$ – $\ce{CH3}$ – $\ce{C6H4}$ – $\overset{\ominus}{\ddot{\mathrm{C}}}\mathrm{H_2}$
Choose the correct answer from the options given below :
1. (1)I $>$ II $>$ IV $>$ V $>$ III
2. (2)I $>$ IV $>$ II $>$ V $>$ III
3. (3)IV $>$ I $>$ II $>$ V $>$ III
4. (4)IV $>$ II $>$ I $>$ III $>$ V
ChemistryJEE Main 24 Jan 2026, Shift 2·Q10·MCQ·Easy–moderate
Open
Electronic effects and stability
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 s-character of the carbon carrying the negative charge.
Choose the correct answer from the options given below.
1. (1)A, D & E only
2. (2)B, D & E only
3. (3)A, C & D only
4. (4)B & D only
We corrected a printing error in the original paper
Statement A: source printed “Resonating structure with more number of covalent bonds and lesser charge separation are more stable”.
ChemistryJEE Main 28 Jan 2026, Shift 1·Q2·MCQ·Easy
Open
Carbanion stability
CORRECT order of stability for the following is
$\ce{CH2=CH^-}$ , $\ce{CH3-CH2^-}$ , $\ce{CH\bond{3}C^-}$
1. (1) $\ce{CH3-CH2^-}$ $>$ $\ce{CH2=CH^-}$ $>$ $\ce{CH\bond{3}C^-}$
2. (2) $\ce{CH2=CH^-}$ $>$ $\ce{CH\bond{3}C^-}$ $>$ $\ce{CH3-CH2^-}$
3. (3) $\ce{CH\bond{3}C^-}$ $>$ $\ce{CH2=CH^-}$ $>$ $\ce{CH3-CH2^-}$
4. (4) $\ce{CH\bond{3}C^-}$ $>$ $\ce{CH3-CH2^-}$ $>$ $\ce{CH2=CH^-}$
ChemistryJEE Main 28 Jan 2026, Shift 2·Q10·MCQ·Easy–moderate
Open
Hyperconjugation in carbocations
The cyclic cations having the same number of hyperconjugation are :
- (A)
- (B)
- (C)
- (D)
Choose the correct answer from the options given below :
1. (1)A and C Only
2. (2)B and C Only
3. (3)A and B Only
4. (4)A, C and D only
ChemistryJEE Main 2 Apr 2026, Shift 1·Q15·MCQ·Easy
Open
IUPAC functional group priority
In IUPAC nomenclature, the correct order of decreasing priority of functional group is :
1. (1) $-\mathrm{CONH_2}$ , $\mathord{>}\mathrm{C{=}O}$ , $-\mathrm{CHO}$ , $-\mathrm{NH_2}$ , $-\mathrm{C{\equiv}C}-$
2. (2) $-\mathrm{CONH_2}$ , $-\mathrm{COOCH_3}$ , $-\mathrm{CHO}$ , $-\mathrm{NH_2}$ , $-\mathrm{OH}$
3. (3) $-\mathrm{CONH_2}$ , $-\mathrm{CHO}$ , $\mathord{>}\mathrm{C{=}O}$ , $-\mathrm{NH_2}$ , $-\mathrm{C{\equiv}C}-$
4. (4) $-\mathrm{CONH_2}$ , $-\mathrm{CHO}$ , $-\mathrm{CN}$ , $-\mathrm{NH_2}$ , $-\mathrm{C{\equiv}C}-$
ChemistryJEE Main 2 Apr 2026, Shift 2·Q13·MCQ·Easy–moderate
Open
Resonance stabilisation of carbocation carbanion
Given below are two statements :
Statement I : In
, the
carbocation is stabilised by +R effect of $\ce{-OCH3}$ group.
Statement II : In
, the
carbanion is stabilised by $-$ R effect of $\ce{-NO2}$ group.
In the light of the above statements, choose the correct answer from the options given below :
1. (1)Both Statement I and Statement II are true
2. (2)Both Statement I and Statement II are false
3. (3)Statement I is true but Statement II is false
4. (4)Statement I is false but Statement II is true
ChemistryJEE Main 4 Apr 2026, Shift 1·Q13·MCQ·Easy
Open
Inductive effect of substituents
Increasing order of electron withdrawing power of following functional groups is :
- (a) $\ce{-CN}$
- (b) $\ce{-COOH}$
- (c) $\ce{-NO2}$
- (d) $\ce{-I}$
1. (1)c $<$ b $<$ d $<$ a
2. (2)c $<$ a $<$ b $<$ d
3. (3)d $<$ b $<$ a $<$ c
4. (4)a $<$ b $<$ c $<$ d

ChemistryJEE Main 4 Apr 2026, Shift 2·Q6·MCQ·Easy–moderate

Open

Types of organic reaction mechanisms

Match the LIST-I with LIST-II

List-I		List-II
Reaction		Mechanism
A.	Williamson Synthesis	I.	Electrophilic addition
B.	Friedel Crafts Reaction	II.	Free radical substitution
C.	Bromination of vinyl benzene	III.	Nucleophilic substitution
D.	Chlorination of toluene in light	IV.	Electrophilic substitution

Choose the correct answer from the options given below:

(1)A-III, B-I, C-II, D-IV
(2)A-III, B-IV, C-II, D-I
(3)A-III, B-IV, C-I, D-II
(4)A-I, B-III, C-IV, D-II

We corrected a printing error in the original paper

Source printed “Friedel Craft Reaction”.

ChemistryJEE Main 4 Apr 2026, Shift 2·Q11·MCQ·Moderate
Open
Resonance and bond length
Consider the following molecules/species:
The correct order of carbon – oxygen double bond length is:
1. (1)x $>$ y $>$ z
2. (2)y $>$ z $>$ x
3. (3)z $>$ x $>$ y
4. (4)x $>$ z $>$ y
We corrected a printing error in the original paper
In structure (y) the source printed the lower group as “CH”; corrected in the figure to “CH $_3$ ” (propanone), the subscript copied from the upper CH $_3$ of the same drawing.
ChemistryJEE Main 4 Apr 2026, Shift 2·Q15·MCQ·Easy–moderate
Open
Stereoisomerism and chirality
The following structures are
and
1. (1)enantiomer
2. (2)Identical molecules
3. (3)Diastereomers
4. (4)meso compound
ChemistryJEE Main 4 Apr 2026, Shift 2·Q16·MCQ·Easy–moderate
Open
Acidity of phenols and acids
The descending order of acidity among the following compounds is
(A) (B)
(C) (D)
(E)
Choose the correct answer from the option given below options
1. (1)B $>$ D $>$ E $>$ A $>$ C
2. (2)D $>$ B $>$ E $>$ A $>$ C
3. (3)C $>$ A $>$ B $>$ D $>$ E
4. (4)D $>$ E $>$ B $>$ A $>$ C
ChemistryJEE Main 5 Apr 2026, Shift 1·Q13·MCQ·Easy–moderate
Open
Carbanion stability inductive and resonance
Given below are two statements :
Statement I : On the basis of inductive effect, the order of stability of alkyl carbanions is $\ce{CH3^-}$ $>$ $\ce{CH3-CH2^-}$ $>$ $\ce{(CH3)2CH^-}$ $>$ $\ce{(CH3)3C^-}$ .
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
1. (1)Both Statement I and Statement II are correct
2. (2)Both Statement I and Statement II are incorrect
3. (3)Statement I is correct and Statement II is incorrect
4. (4)Statement I is incorrect and Statement II is correct
ChemistryJEE Main 5 Apr 2026, Shift 2·Q14·MCQ·Easy–moderate
Open
IUPAC nomenclature and carbon degree
Identify the correct IUPAC name of hydrocarbon (x) containing three primary carbon atoms and with molar mass 72 g mol $^{-1}$ .
1. (1)1,1-Dimethylcyclopropane
2. (2)2,2-Dimethylpropane
3. (3)2-Methylbutane
4. (4)n-pentane
ChemistryJEE Main 6 Apr 2026, Shift 1·Q14·MCQ·Easy–moderate
Open
Metamerism and keto-enol tautomerism
Given below are two statements :
Statement-I : 2, 6-diethylcyclohexanone and 6-methyl-2-n-propylcyclohexanone are metamers.
Statement-II : 2, 2, 6, 6-tetramethylcyclohexanone exhibits keto-enol tautomerism.
In the light of the above statements, choose the correct answer from the options given below.
1. (1)Both Statement-I and Statement-II are true.
2. (2)Both Statement-I and Statement-II are false.
3. (3)Statement-I is true but Statement-II is false.
4. (4)Statement-I is false but Statement-II is true.
ChemistryJEE Main 6 Apr 2026, Shift 2·Q13·MCQ·Easy–moderate
Open
Resonance and bond length
Shown below is the structure of methyl acetate with three different $\alpha$ , $\beta$ and $\gamma$ carbon-oxygen bonds.
The correct order of bond length of these bonds is :
1. (1) $\alpha > \beta > \gamma$
2. (2) $\alpha < \beta < \gamma$
3. (3) $\alpha = \beta = \gamma$
4. (4) $\alpha < \beta = \gamma$
ChemistryJEE Main 8 Apr 2026, Shift 2·Q13·MCQ·Moderate
Open
Carbocation rearrangement
The major product of which of the following reaction is not obtained by rearrangement reaction?
1. (1)
2. (2)
3. (3)
4. (4)
ChemistryJEE Main 8 Apr 2026, Shift 2·Q14·MCQ·Moderate
Open
Aromaticity huckel rule
The total number of aromatic compounds/species from the following is
1. (1)6
2. (2)4
3. (3)3
4. (4)5

(A)	(B)
(C)	(D)
(E)