$PhC{{O}_{2}}H\xrightarrow[2.\,N{{H}_{3}}]{1.\,PC{{l}_{5}}}A\xrightarrow[2.\,{{H}_{2}}/Ni]{1.\,{{P}_{4}}{{O}_{10}}.heat}B.$ અંતિમ નીપજ $(B)$ શું હશે ?
(1) (2) $CH_3CH_2NH_2$
(3) $(CH_3)_2NH$ (4) $\begin{array}{*{20}{c}}
O \\
{|\,|} \\
{C{H_3} - C - N{H_2}}
\end{array}$
(Figure) $\xrightarrow[FeB{{r}_{3}}]{B{{r}_{2}}}B\xrightarrow{Sn\,/\,HCl}C$ $\xrightarrow[HCl]{NaN{{O}_{2}}}D\xrightarrow[HBr]{CuBr}E$