Chemistry · Nitrogen Containing Organic Compounds

JEE Main 2026 — 23 January, Morning Shift — Question 53

$x$ ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' $y$ ' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of ' $x$ ' and one mole of ' y ' react with each other in the presence of alkali followed by heating?

Option A:
2-Methylbut-2-enal
Option B:
Pent-2-enal
Option C:
2-Methylpent-2-enal
Option D:
3-Methylbut-2-enal
Correct

Answer: D

Step-by-step solution

\mathrm{CH_3-CH_2-C\equiv N} \xrightarrow[\mathrm{H_3O^+}]{\mathrm{SnCl_2/HCl}} \mathrm{CH_3-CH_2-CHO} \quad (\text{Propanal})\;(X)

\mathrm{CH_3-CH=CH-CH_3} \xrightarrow{\text{Ozonolysis}} \mathrm{CH_3-CHO} \quad (\text{Ethanal})\;(Y)

(X)+(Y) \xrightarrow[\Delta]{\mathrm{NaOH}} \text{3-Methylbut-2-enal (Not formed)}

\mathrm{CH_3-CH_2-CHO + CH_3-CHO} \xrightarrow[\Delta]{\mathrm{NaOH}}

\mathrm{CH_3-CH_2-CH=C(CH_3)-CHO} \;+\; \mathrm{CH_3-CH=CH-CHO}

\text{2-Methylpent-2-enal} \qquad \text{But-2-enal}

\mathrm{CH_3-CH=C(CH_3)-CHO} \;+\; \mathrm{CH_3-CH_2-CH=CH-CHO}

\text{2-Methylbut-2-enal} \qquad \text{Pent-2-enal}

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 23 January, Morning Shift
Subject: Chemistry
Chapter: Nitrogen Containing Organic Compounds
Topic: Chemical properties of Amines