(i) `CHequivCHoverset(H_(2)O)underset(H_(2)SO_(4)//HgSO_(4))rarr[A]overset(o)rarr[B]overset(SOCl_(2))rarr[C]overset("Benzene")underset(AlCl_(3))rarr[D]`
(ii) `C_(2)H_(5)Cloverset(KCN)rarr[A]overset(H_(2)O"/"H^(+))rarr[B]overset(NH_(3))rarr[C]overset(Heat)rarr[D]`
