Which of the following reacts with chloroform and base to form phenyl isocyanide?

Aniline

The answer is (4) Aniline.

The reaction of chloroform and a base with aniline is called the Carbylamine reaction. In this reaction, the nitrogen atom in the aniline reacts with the chloroform to form a phenyl isocyanide.

The chemical equation for the reaction is:

Phenyl isocyanide is a foul-smelling compound that is used in the synthesis of other chemicals.

The other options are incorrect. Option (1), nitrobenzene, does not react with chloroform and a base to form phenyl isocyanide. Option (2), phenol, does not react with chloroform and a base to form phenyl isocyanide. Option (3), chlorobenzene, does not react with chloroform and a base to form phenyl isocyanide.