Given the stuctures of A,B and C in the following reactions-
(i) `C_6H_5N_2^+Cl^(-)overset(CuCN)toAoverset(H_2O //H^+)toBunderset(Delta)overset(H_2O //H^+)toC`
(ii) `C_6H_5NO_2overset(Sn+HCl)toAunderset(273K)overset(NaNO_2+HCl)toBunderset(Delta)overset(H_2O //H^+)toC`