A aromatic hydrocarbon (A) of molecular formula C6H6 reacts with Conc.HNO3 and Conc. H2SO4 gives (B) of formula C6H5O2N. (B) on reaction with Sn/HCI gives (C) of formula C6H7N which answers carbylamine reaction. (C) on treatment with chloroform and alkali gives (D) of formula C7H5N. Identify A, B, C, D and explain the reactions involved.
