Answer :

The reagents Br2 with KOH (strong base) is used in the Hoffman reaction. This reaction is used to convert amides to amines with the loss of carbonyl carbon atom.

The given molecular formula of ‘B’ is C6H7N, and as per Hoffman reaction, this should be an amine.


Also, it is mentioned that the starting product, ‘A’ is aromatic, therefore ‘A’ is an aromatic amide which loses carbonyl carbon atom upon reaction with Br2 and KOH.


Hence, for the molecular formula of ‘A’, we should add -CO to the molecular formula of ‘B’.


C7H7NO is the molecular formula of aromatic amide ‘A’.


The only aromatic amide having this molecular formula is benzamide.


Structure of ‘A’


Hoffman Reaction occurs and ‘B’ is formed.


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Aniline reacts with CHCl3 and KOH, by carbylamine reaction to give a foul smelling compound ‘C’, benzene isonitrile.


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