Chemistry · Hydrocarbons

JEE Main 2026 — 23 January, Morning Shift — Question 57

But-2-yne and hydrogen (one mole each) are separately treated with (i) $\mathrm{Pd} / \mathrm{C}$ and (ii) $\mathrm{Na} /$ liq. $\mathrm{NH}_{3}$ to give the products X and Y respectively.

Identify the incorrect statements.

A. $X$ and $Y$ are stereoisomers.

B. Dipole moment of X is zero

C. Boiling point of X is higher than Y .

D. X and Y react with $\mathrm{O}_{3} / \mathrm{Zn}+\mathrm{H}_{2} \mathrm{O}$ to give different products.

Choose the correct answer from the options given below :

Option A:
B and C only
Correct
Option B:
B and D only
Option C:
A and B only
Option D:
A and C only

Answer: A

Step-by-step solution

Dipole moment $\mathrm{x} \neq 0$ $\underset{(\text { Cis } / \text { Trans })}{\text { But }-2-\text { ene }} \underset{\text { (ii) } \mathrm{Zn} / \mathrm{H}_{2} \mathrm{O}}{\text { (i) } \mathrm{O}_{3}} \underset{\text { (Acetaldehyde) }}{2 \mathrm{CH}_{3}-\mathrm{CHO}}$

Answer key and solution verified before publishing.

Practise Hydrocarbons

Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.

Solve a similar one free

Exam: JEE Main 2026
Paper: 23 January, Morning Shift
Subject: Chemistry
Chapter: Hydrocarbons
Topic: Properties & Uses of Alkenes and Dienes