When benzyl bromide is treated with sodium cyanide benzyl cyanide ( A ) is formed. This on acid hydrolysis forms 2 -Phenylethanoic acid ( C ), which can also be prepared from Grignard reagent benzyl magnesium bromide ( B ). From the above reactions, A , B and C are benzyl cyanide, benzyl magnesium bromide and 2 -Phenylethanoic acid respectively.

An organic compound A C 7 H 6 O has the smell of bitter almonds. Compound A reacts with ammonia to give compound B C 21 H 8 N 2 . Compound A also reacts with a dilute alcoholic KCN to form compound C C 14 H 12 O 2 . Identify A , B and C . Explain the reaction.

The chemical formula of Benzaldehyde is C 6 H 5 - CHO , and has the smell of bitter almonds. (I) When Benzaldehyde reacts with ammonia, so Hydro benzamide C 21 H 8 N 2 is formed. 3 C 6 H 5 - CHO A - Benzaldehyde + 2 NH 3 → C 6 H 5 CH C 6 H 5 CH = N 2 B - Hydro benzamide + 3 H 2 O (II) When benzaldehyde is treated with alcoholic potassium cyanide, so benzoin is formed. 2 C 6 H 5 - CHO A - Benzaldehyde → Alc . KCN C 6 H 5 - CH OH - CO - C 6 H 5 C - Benzoin