Question

In the above given chemical reaction, the compounds $A$ and $B$ respectively, are :

• A. Nitrobenzene and chlorobenzene
• B. Nitrobenzene and fluorobenzene
• C. Phenol and benzene
• D. Benzene diazonium chloride and fluorobenzene

Answer 1

Answer: (D)

Benzene diazonium chloride and fluorobenzene

In this reaction, aniline is diazotized to obtain benzene diazonium chloride (compound $A$).

The diazonium group of benzene diazonium chloride is then replaced with $F$ by Balz-Schiemann reaction.

The compounds $A$ and $B$ are benzene diazonium chloride and flurobenzene respectively.

Option D is correct.