JEE Main 2026 — Apr 5, Shift 1 — Chemistry solution

JEE Main2026Apr 5, Shift 1Chemistry

Benzyl isocyanide can be obtained from

Choose the correct answer from the options given below :

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

Solution

Benzyl isocyanide is $C_{6} H_{5} CH_{2} NC$ .

(A) AgCN with an alkyl halide donates the nitrogen end (covalent Ag-CN preference), giving isocyanide: $PhCH_{2} Br + AgCN \to PhCH_{2} NC$ . Gives benzyl isocyanide.

(B) Hofmann carbylamine reaction on benzylamine: $PhCH_{2} NH_{2} + CHCl_{3} + NaOH \to PhCH_{2} NC$ . Gives benzyl isocyanide.

(D) Carbylamine reaction on aniline gives phenyl isocyanide ( $C_{6} H_{5} NC$ ), not benzyl isocyanide.

(E) KCN with the alkyl halide gives the cyanide (nitrile) $PhCH_{2} CH_{2} CN$ , not an isocyanide, and the chain length is wrong anyway.

Correct sources: A and B.

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