Give the structures of $A$,$B$ and $C$ in the following reactions:
$(i)$ $CH_3CH_2I$ $\xrightarrow{NaCN} A$ $\xrightarrow[Partial\,hydrolysis]{OH^{-}} B$ $\xrightarrow{NaOH+Br_2} C$
$(ii)$ $C_6H_5N_2Cl$ $\xrightarrow{CuCN} A$ $\xrightarrow{H_2O/H^{+}} B$ $\xrightarrow[\Delta]{NH_3} C$
$(iii)$ $CH_3CH_2Br$ $\xrightarrow{KCN} A$ $\xrightarrow{LiAlH_4} B$ $\xrightarrow[0\ ^oC]{HNO_2} C$
$(iv)$ $C_6H_5NO_2$ $\xrightarrow{Fe/HCl} A$ $\xrightarrow[273\ K]{NaNO_2+HCl} B$ $\xrightarrow[\Delta]{H_2O/H^{+}} C$
$(v)$ $CH_3COOH$ $\xrightarrow[\Delta]{NH_3} A$ $\xrightarrow{NaOBr} B$ $\xrightarrow{NaNO_2/HCl} C$
$(vi)$ $C_6H_5NO_2$ $\xrightarrow{Fe/HCl} A$ $\xrightarrow[273\ K]{HNO_2} B$ $\xrightarrow{C_6H_5OH} C$

(N/A) $(i)$ $CH_3CH_2I$ $\xrightarrow{NaCN} \underset{(A)}{CH_3CH_2CN}$ $\xrightarrow[Partial\,hydrolysis]{OH^{-}} \underset{(B)}{CH_3CONH_2}$ $\xrightarrow{NaOH+Br_2} \underset{(C)}{CH_3NH_2}$
$(ii)$ $C_6H_5N_2Cl$ $\xrightarrow{CuCN} \underset{(A)}{C_6H_5CN}$ $\xrightarrow{H_2O/H^{+}} \underset{(B)}{C_6H_5COOH}$ $\xrightarrow[\Delta]{NH_3} \underset{(C)}{C_6H_5CONH_2}$
$(iii)$ $CH_3CH_2Br$ $\xrightarrow{KCN} \underset{(A)}{CH_3CH_2CN}$ $\xrightarrow{LiAlH_4} \underset{(B)}{CH_3CH_2CH_2NH_2}$ $\xrightarrow[0\ ^oC]{HNO_2} \underset{(C)}{CH_3CH_2CH_2OH}$
$(iv)$ $C_6H_5NO_2$ $\xrightarrow{Fe/HCl} \underset{(A)}{C_6H_5NH_2}$ $\xrightarrow[273\ K]{NaNO_2+HCl} \underset{(B)}{C_6H_5N_2^+Cl^-}$ $\xrightarrow[\Delta]{H_2O/H^{+}} \underset{(C)}{C_6H_5OH}$
$(v)$ $CH_3COOH$ $\xrightarrow[\Delta]{NH_3} \underset{(A)}{CH_3CONH_2}$ $\xrightarrow{NaOBr} \underset{(B)}{CH_3NH_2}$ $\xrightarrow{NaNO_2/HCl} \underset{(C)}{CH_3OH}$
$(vi)$ $C_6H_5NO_2$ $\xrightarrow{Fe/HCl} \underset{(A)}{C_6H_5NH_2}$ $\xrightarrow[273\ K]{HNO_2} \underset{(B)}{C_6H_5N_2^+Cl^-}$ $\xrightarrow{C_6H_5OH} \underset{(C)}{p-C_6H_5-N=N-C_6H_4OH}$