JEE Main 2026 — Apr 2, Shift 2 — Chemistry solution

JEE Main2026Apr 2, Shift 2Chemistry

A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements about (Y) and (Z).

(A) Both (Y) and (Z) have same molar mass

(B) (Y) and (Z) can be distinguished from each other by NaHCO $_{3}$

(D) (Y) and (Z) undergo addition reaction with $2, 4$ -DNP

Choose the correct answer from the options given below :

A
A, B and C Only
B
B and C Only
C
C and D Only
D
A and D Only

Solution

Acid-catalysed hydrolysis of the vinyl ether produces two enols, which tautomerise to two carbonyl compounds:

(Y) propanal (CH $_{3}$ CH $_{2}$ CHO), from the propenyl alcohol fragment.

(Z) acetone (CH $_{3}$ COCH $_{3}$ ), from the isopropenyl alcohol fragment.

(A) Both have molecular formula C $_{3}$ H $_{6}$ O and molar mass $58$ g/mol. $✓$

(B) Neither is a carboxylic acid; NaHCO $_{3}$ does not distinguish them. $\times$

(C) Aldehydes react with HCN faster than ketones owing to lower steric hindrance and greater electrophilicity. The rates differ. $\times$

(D) Both are carbonyl compounds and form $2, 4$ -DNP hydrazones (an addition-elimination, often called addition). $✓$

Correct: A and D.

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