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Previous year question hub

Isomerism - Organic Chemistry - Chemistry Previous Year Questions

Practice Isomerism - Organic Chemistry - Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

9Papers
9Years
13Questions
1Topics

Isomerism question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Isomerism. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Not classified 13 100%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

Multiple Choices 13 100%

Subject weightage

Top subjects by unique question coverage.

Chemistry
13 Qs

Most asked topics

Top topics across the included previous year papers.

Organic Chemistry
13 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Isomerism
13 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

WB JEE 2025
1 Qs
WB JEE 2024
1 Qs
WB JEE 2023
1 Qs
WB JEE 2022
4 Qs
WB JEE 2021
1 Qs
WB JEE 2020
1 Qs
WB JEE 2019
2 Qs
WB JEE 2018
1 Qs
WB JEE 2016
1 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
WB JEE 202520251View paper
WB JEE 202420241View paper
WB JEE 202320231View paper
WB JEE 202220224View paper
WB JEE 202120211View paper
WB JEE 202020201View paper
WB JEE 201920192View paper
WB JEE 201820181View paper
WB JEE 201620161View paper

All Isomerism previous year questions

Practice every matching question in batches of 20, with every available option.

1
2016 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2016
Choose the correct statement(s) among the following.
A

WB JEE 2016 Chemistry - Isomerism Question 10 English Option 1

are enantiomers

B
CH3CHO on reaction with HCN gives racemic mixture
C

WB JEE 2016 Chemistry - Isomerism Question 10 English Option 3 are enantiomers

D
CH3 \(-\) CH \(=\) NOH shows geometrical isomerism
Open complete paper
2
2018 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2018
The major products obtained in the following reaction is/are

WB JEE 2018 Chemistry - Isomerism Question 11 English
A
WB JEE 2018 Chemistry - Isomerism Question 11 English Option 1
B
WB JEE 2018 Chemistry - Isomerism Question 11 English Option 2
C
WB JEE 2018 Chemistry - Isomerism Question 11 English Option 3
D
WB JEE 2018 Chemistry - Isomerism Question 11 English Option 4
Open complete paper
3
2019 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2019
The conformations of n-butane, commonly known as eclipsed, gauche and anti-conformations can be interconverted by
A
rotation around C - H bond of a methyl group
B
rotation around C - H bond of a methylene group
C
rotation around C1-C2 linkage
D
rotation around C2-C3 linkage
Open complete paper
4
2019 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2019
The total number of isomeric linear dipeptides which can be synthesised from racemic alanine is
A
1
B
2
C
3
D
4
Open complete paper
5
2020 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2020
Which of the following compounds is asymmetric?
A
WB JEE 2020 Chemistry - Isomerism Question 14 English Option 1
B
WB JEE 2020 Chemistry - Isomerism Question 14 English Option 2
C
WB JEE 2020 Chemistry - Isomerism Question 14 English Option 3
D
WB JEE 2020 Chemistry - Isomerism Question 14 English Option 4
Open complete paper
6
2021 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2021
WB JEE 2021 Chemistry - Isomerism Question 9 English
The relationship between the pair of compounds shown above are respectively
A
Homomer (identical), enantiomer and constitutional isomer
B
Enantiomer, enantiomer and diastereomer
C
Homomer (identical), homomer (identical) and constitutional isomer
D
Enantiomer, homomer (identical) and geometrical isomer
Open complete paper
7
2022 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2022

WB JEE 2022 Chemistry - Isomerism Question 5 English

The correct relationship between molecules I and II is

A
Enantiomer
B
Homomer
C
Diastereomer
D
Constitutional isomer
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8
2022 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2022

The enol form in which ethyle-3-oxobutanoate exists is

A
WB JEE 2022 Chemistry - Isomerism Question 6 English Option 1
B
WB JEE 2022 Chemistry - Isomerism Question 6 English Option 2
C
WB JEE 2022 Chemistry - Isomerism Question 6 English Option 3
D
WB JEE 2022 Chemistry - Isomerism Question 6 English Option 4
Open complete paper
9
2022 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2022

How many monobriminated product(s) (including stereoisomers) would form in the free radical bromination of n-butane?

A
2
B
1
C
3
D
4
Open complete paper
10
2022 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2022

The correct order of relative stability of the given conformers of n-butane is

WB JEE 2022 Chemistry - Isomerism Question 8 English

A
II > I = III
B
II > III > I
C
II > I > III
D
I = III > II
Open complete paper
11
2023 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2023

WB JEE 2023 Chemistry - Isomerism Question 4 English 1WB JEE 2023 Chemistry - Isomerism Question 4 English 2

The relationship between the pair of compounds shown above are respectively,

A
enantiomer, diastereomer, diastereomer
B
enantiomer, enantiomer, diastereomer
C
enantiomer, homomer (identical), diastereomer
D
homomer (identical), diastereomer, geometrical isomer
Open complete paper
12
2024 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2024

Which of the following represent(s) the enantiomer of Y ?

WB JEE 2024 Chemistry - Isomerism Question 3 English

A
WB JEE 2024 Chemistry - Isomerism Question 3 English Option 1
B
WB JEE 2024 Chemistry - Isomerism Question 3 English Option 2
C
WB JEE 2024 Chemistry - Isomerism Question 3 English Option 3
D
WB JEE 2024 Chemistry - Isomerism Question 3 English Option 4
Open complete paper
13
2025 · Chemistry · Organic Chemistry · Isomerism
WB JEE 2025

The compound(s) showing optical activity is/are

A
WB JEE 2025 Chemistry - Isomerism Question 2 English Option 1
B
WB JEE 2025 Chemistry - Isomerism Question 2 English Option 2
C
WB JEE 2025 Chemistry - Isomerism Question 2 English Option 3
D
WB JEE 2025 Chemistry - Isomerism Question 2 English Option 4
Open complete paper