JEE Chemistry

Isomerism (Structural, Stereoisomerism): JEE Questions & Solutions

31 previous-year JEE Chemistry questions on Isomerism (Structural, Stereoisomerism), each with a worked step-by-step solution.

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Previous-year questions

  1. 01Identify correct statements from the following: A. Propanal and propanone are functional isomers. B. Ethoxyethane and methoxypropane are…MCQEasyJEE 2026
  2. 02A hydrocarbon 'P' (C₄H₈) on reaction with HCl gives an optically active compound 'Q' (C₄H₉Cl) which on reaction with one mole of ammonia…MCQMediumJEE 2026
  3. 03Given below are four compounds: (a) n-propyl chloride (b) iso-propyl chloride (c) sec-butyl chloride (d) neo-pentyl chloride Percentage of…MCQMediumJEE 2026
  4. 04Match List - I with List - II. | List - I (Pair of Compounds) | List - II (Type of Isomers) | | --- | --- | | A. 2-Methylpropene and…MCQEasyJEE 2026
  5. 05But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/liq.NH₃ to give the products X and Y respectively.…MCQMediumJEE 2026
  6. 06Consider all the structural isomers with molecular formula C₅H₁₁Br are separately treated with KOH(aq) to give respective substitution…NVAMediumJEE 2026
  7. 07Given below are two statements: Statement I: There are several conformers for n-butane. Out of those conformers, Statement II: As the…MCQEasyJEE 2026
  8. 08How many different stereoisomers are possible for the given molecule?MCQMediumJEE 2025
  9. 09The incorrect statements regarding geometrical isomerism are: (A) Propene shows geometrical isomerism. (B) Trans isomer has identical…MCQEasyJEE 2025
  10. 10The alkane from below having two secondary hydrogens is:MCQMediumJEE 2025
  11. 11Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.MCQMediumJEE 2025
  12. 12The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is:NVAEasyJEE 2025
  13. 13The hydrocarbon (X) with molar mass 80 g mol⁻¹ and 90% carbon has degree of unsaturation.NVAEasyJEE 2025
  14. 14Given below are two statements: Statement (I): are isomeric compounds. Statement (II): are functional group isomers. In the light of the…MCQEasyJEE 2025
  15. 15Identify the correct statements from the following A. B. C. D. Choose the correct answer from the options given belowMCQMediumJEE 2025
  16. 16The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula C₉H₁₂ is.NVAMediumJEE 2025
  17. 17Consider the following molecule X. X on reaction with HBr gives a major product. The structure of the major product is:MCQEasyJEE 2025
  18. 18Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:MCQMediumJEE 2025
  19. 19The incorrect statement regarding conformations of ethane is:MCQEasyJEE 2024
  20. 20Total number of compounds with chiral carbon atoms from the following is: 2-methylcyclohexan-1-one, cyclopentane-1,3-dione,…NVAMediumJEE 2024
  21. 21Which one of the following will show geometrical isomerism?MCQEasyJEE 2024
  22. 22Number of geometrical isomers possible for the given structure is/are:MCQMediumJEE 2024
  23. 232-chlorobutane + Cl₂ → C₄H₈Cl₂ (isomers) Total number of optically active isomers shown by C₄H₈Cl₂, obtained in the above reaction is:MCQMediumJEE 2024
  24. 24The total number of stereoisomers possible for the given structure is:MCQMediumJEE 2024
  25. 25Maximum number of isomeric monochloro derivatives that can be obtained from 2,2,5,5-tetramethylhexane by chlorination is:NVAMediumJEE 2023
  26. 26Which of the following conformations will be the most stable?MCQEasyJEE 2023
  27. 27Match List I with List II | List I (Isomeric pairs) | List II (Type of isomers) | |---|---| | (A) Propanamine and N-Methylethanamine | (I)…MCQEasyJEE 2023
  28. 28The isomeric deuterated bromide with molecular formula C₄H₈DBr having two chiral carbon atoms is:MCQMediumJEE 2023
  29. 29The total number of chiral compound/s from the following is.NVAEasyJEE 2023
  30. 30Testosterone, which is a steroidal hormone, has the following structure. The total number of asymmetric carbon atom/s in testosterone isNVAMediumJEE 2023
  31. 31Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: A solution of the…MCQMediumJEE 2023

Frequently asked questions

Our bank has 31 previous-year JEE Chemistry questions tagged to Isomerism (Structural, Stereoisomerism), drawn from JEE papers between 2023 and 2026, including 7 from 2026 alone. Each comes with a full step-by-step solution.

Isomerism (Structural, Stereoisomerism) is rated Advanced overall for JEE Chemistry. The PYQs on this page break down as 18 medium, 13 easy.

Of the 31 previous-year questions on Isomerism (Structural, Stereoisomerism), 23 are multiple-choice (MCQ) and 8 are numerical-value (NVA) questions.

Based on recent paper analysis, Isomerism (Structural, Stereoisomerism) is worth about 2 marks in JEE Main. It sits in Basic Principles of Organic Chemistry, a Class 11 Chemistry chapter.

More Basic Principles of Organic Chemistry topics

Electronic Effects (Inductive, Resonance, Hyperconjugation)30Reaction Mechanisms (Substitution, Addition, Elimination)20Nomenclature (IUPAC & Common)11Classification & Functional Groups2

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