Q.CH3-CN reacts with 2H2O/H+ (-NH3) to give [A]; [A] reacts with NH3 to give [B]; [B] on heating (Delta, -H2O) gives [C]. Write chemical formula of [A], [B] and [C] in the above reaction sequence.

Four reactions act on the -COOH group as a whole. REDUCTION: LiAlH4 (or H2/copper chromite) gives a primary alcohol -- notably, NaBH4 does NOT reduce -COOH at all, unlike its ready reduction of an aldehyde/ketone; HI/red P at 473 K instead gives COMPLETE reduction to the same-carbon-count alkane. DECARBOXYLATION: the sodium salt, heated with soda lime (NaOH:CaO, 3:1), loses CO2 to give an alkane one carbon shorter, e.g. sodium acetate gives methane. KOLBE'S ELECTROLYTIC DECARBOXYLATION: electrolysis of the aqueous sodium/potassium salt gives an alkane at the ANODE with twice the alkyl carbon count (two carboxyl radicals lose CO2 to alkyl radicals, which then dimerise), e.g. 2 sodium acetate gives e …