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Chemistry · Isomerism

JEE Main 2026 — 21 January, Morning Shift — Question 60

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. Option A:

    B, C and D only

  2. Option B:

    A, B and C only

  3. Option C:

    A, B and E only

    Correct
  4. Option D:

    C, D and E only

Answer: C

Step-by-step solution

figure

are Functional isomer

CH3−CH=CH−CH3&CH3−CH2−CH=CH2\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{3} \& \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2}

Are Positional isomer

CH3−CH2−O−CH2−CH3&CH3−CH2−CH2−O−CH3\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \& \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}_{3}

are Metamer

CH3−CH=CH−CH3\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{3} does not have optical isomer

figure

Chain isomer

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
21 January, Morning Shift
Subject
Chemistry
Chapter
Isomerism
Topic
Introduction & Structural Isomerism
Identify correct statement from the following : A. Propanal and… | JEE Main 2026 PYQ with Solution · DhiX AI