Chlorobenzene can be prepared by reacting aniline with:

• (A) - Hydrochloric acid
• (B) - Cuprous chloride
• (C) - Chlorine in the presence of anhydrous aluminium chloride
• (D) - Nitrous acid followed by heating with cuprous chloride

Chlorobenzene is an aromatic compound that can be synthesized through various chemical reactions. When considering the options provided, the correct method involves:

Reaction with Aniline

Aniline can react with:

• Hydrochloric acid: This does not lead to chlorobenzene.
• Cuprous chloride: This is not a direct method for producing chlorobenzene.
• Chlorine in the presence of anhydrous aluminium chloride: This method is effective for chlorination but is not the best choice here.
• Nitrous acid followed by heating with cuprous chloride: This is the correct answer.

Final Answer

The preparation of chlorobenzene from aniline is best achieved by using nitrous acid followed by heating with cuprous chloride (Option D).