(image) $\xrightarrow{{SOC{l_2}}}\,B\,\xrightarrow{{N{H_3}}}\,C$$\,\xrightarrow[{B{r_2}}]{{NaOH}}\,D$

$(1)$   $C{H_3}C{H_2}N{H_2}$                    $(2)$   $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2}C{H_3}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,}\\
{\,C{H_3}C{H_2}NH\,\,\,\,\,\,\,}
\end{array}$

$(3)$   $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,C{H_3}}\\
{\,|}\\
{{H_3}C - N - C{H_3}}
\end{array}$                                $(4)$     $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,C{H_3}}\\
{\,|}\\
{Ph - N - H}
\end{array}$

$\begin{gathered} {C_2}{H_5}MgBr\,\,\xrightarrow{{ClCN}}\,\mathop {{C_2}{H_5}}\limits_{(a)} CN\,\xrightarrow{{{H_3}O{\,^ + }}}\,\,B \hfill \\ C{H_3}COC{H_3}\,\mathop {\xrightarrow[{NaOH}]{}}\limits^{{I_2}} \,X\,\,\mathop + \limits_{} \,\,CH{I_3}\,\mathop {\xrightarrow{{Ag}}}\limits_{} \,\,\,Y\, \hfill \\ \,{C_6}{H_5}N{H_2}\,\,\mathop {\xrightarrow[{HCL}]{}}\limits^{NaN{O_2}} \,\,P\,\,\,\xrightarrow{{CuCN}}\,\,Q\,\,\,\xrightarrow{{ + 4H}}\,\,R \hfill \\ \end{gathered} $