Chemistry - Halogen Derivative Question with Solution | TestHub

The carbylamine test (isocyanide test) is used for the detection of primary amines (both aliphatic and aromatic). In this test, a primary amine is heated with chloroform and alcoholic potassium hydroxide to form an isocyanide, which has a foul smell.

Secondary and tertiary amines do not give this test.

$({\text{C}}_2{\text{H}}_5{)}_3\text{N}$ is a tertiary amine, so it does not exhibit the carbylamine test.

The other three compounds are primary amines (containing the $-{\text{NH}}_2$ group) and will give a positive carbylamine test.

Answer: $({\text{C}}_2{\text{H}}_5{)}_3\text{N}$