Question

The conversion of benzene diazonium chloride to bromobenzene by treating with HBr in the presence of copper powder is called

• A. Sandmeyer reaction
• B. Gattermann reaction
• C. Wurtz reaction
• D. Hoffmann reaction
• E. Gabriel synthesis

Answer 1

The Correct Option is C

The conversion of benzene diazonium chloride to bromobenzene by treating with HBr in the presence of copper powder is known as the Gattermann reaction.

The Gattermann reaction is used for the introduction of a formyl group (-CHO) into an aromatic ring, not the formation of aryl halides from diazonium salts. The correct reaction for converting a diazonium salt to an aryl halide, like bromobenzene from benzene diazonium chloride, is the Sandmeyer reaction. 
- Sandmeyer reaction involves the substitution of a diazonium group with a halogen (such as bromine or chlorine) using copper salts. 
- Gattermann reaction is used for formylation of aromatic rings (introducing the -CHO group).
 - Wurtz reaction is used for the formation of alkanes from alkyl halides. 
- Hoffmann reaction is used for the degradation of amides to amines. - Gabriel synthesis is used to synthesize primary amines from phthalimide.

Correct Answer: (B) Gattermann reaction