Chlorobenzene on heating with \(NH_3\)under pressure in the presence of cuprous chloride gives

Aniline

The correct answer is (2) Aniline.

When chlorobenzene is heated with ammonia under pressure in the presence of cuprous chloride, it undergoes a reaction called diazotization. In this reaction, the ammonia molecule acts as a nucleophile and attacks the carbon atom of the chlorobenzene molecule. The chlorine atom is then displaced by the amino group, forming aniline.

The reaction is shown below:

Aniline is a colorless, oily liquid with a strong odor. It is used in the production of dyes, drugs, and pesticides.

The other options are incorrect.

• Nitrobenzene is formed when benzene is treated with nitric acid and sulfuric acid.
• Benzamide is formed when benzoic acid is treated with ammonia.
• o- and p-chloroaminobenzene are formed when chlorobenzene is treated with ammonia in the absence of cuprous chloride.