MHT CET 2026 Chemistry question

Which from following amines does NOT form alkyl isocyanide when heated with alc. KOH and chloroform

(A)Methanamine
(B)Propan-2-amine
(C)N, N-DiethylethanamineCorrect
(D)Ethanamine

Answer: (C)

Solution

Only PRIMARY aliphatic (and aromatic) amines undergo the carbylamine reaction: \mathrm{R-NH_2 + CHCl_3 + 3KOH \xrightarrow{\Delta} R-NC + 3KCl + 3H_2O}, giving foul-smelling isocyanides. Methanamine (A), propan-2-amine (B) and ethanamine (D) are all primary amines

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Question ID VK-100440