JEE Main 2026 Apr 8 Shift 2, Chemistry Q18: Preparation of Amines

JEE Main2026Apr 8, Shift 2Chemistry

Which statements are True?

A. In Hoffmann bromamide degradation, $4$ moles of NaOH and $2$ moles of Br $_{2}$ are consumed per mole of an amide.

B. Hoffmann bromamide reaction is not given by alkyl amides.

C. Primary amines can be synthesized by Hoffmann bromamide degradation.

D. Secondary amide on reaction with Br $_{2}$ and NaOH will give secondary amine.

E. The by-products of Hoffmann degradation are Na $_{2}$ CO $_{3}$ , NaBr and H $_{2}$ O.

Choose the correct answer from the options given below :

A
A, C and E only
B
B, C and D only
C
C and E only
D
C, D and E only

Solution

The balanced Hoffmann bromamide degradation is:

$R - C (= O) - N H_{2} + B r_{2} + 4 NaOH \to R - N H_{2} + N a_{2} C O_{3} + 2 NaBr + 2 H_{2} O$

A. False. Only $1$ mole of Br $_{2}$ is consumed per mole of amide, not $2$ .

B. False. Alkyl amides (R-CONH $_{2}$ , R = alkyl) do undergo Hoffmann degradation; the reaction is a standard tool to convert $R - CON H_{2}$ to $R - N H_{2}$ with one less carbon.

C. True. The product is always a primary amine (the isocyanate intermediate is hydrolysed and decarboxylates).

D. False. The reaction requires a primary amide ( $- CON H_{2}$ , two N–H bonds). Secondary amides ( $- CONHR$ ) lack the necessary N-H and do not undergo this rearrangement.

E. True. The by-products match the balanced equation.

Correct statements: C and E.

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JEE Main 2026 Apr 8 Shift 2, Chemistry Q18: Preparation of Amines

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