This question tests understanding of amine chemistry reactions. In (i), NaCN substitutes the halide forming nitrile A, which hydrolyzes to amide B, then undergoes Hofmann bromamide degradation to amine C. In (ii), Sandmeyer reaction converts diazonium salt to benzonitrile A, hydrolysis gives benzoic acid B, and reaction with ammonia yields benzamide C. In (iii), KCN gives nitrile A, LiAlH₄ reduces it to amine B, and nitrous acid converts primary amine to alcohol C. In (iv), nitrobenzene reduces to aniline A, diazotization gives diazonium salt B, and hydrolysis yields phenol C. In (v), acetic acid with ammonia gives acetamide A, Hofmann degradation yields methylamine B, and nitrous acid gives methanol C. In (vi), aniline A undergoes diazotization to B, which couples with phenol to give azo compound C.