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

Step-by-step solution

The reaction of an amine with chloroform and alcoholic KOH to form an alkyl isocyanide is known as the carbylamine reaction. This test is given only by primary (aliphatic and aromatic) amines. Secondary and tertiary amines do not respond to this test. Methanamine, propan-2-amine, and ethanamine are primary amines, so they will form alkyl isocyanides. N, N-Diethylethanamine is a tertiary amine, hence it does not undergo the carbylamine reaction and will not form an alkyl isocyanide. Answer: N, N-Diethylethanamine