(Figure) $\xrightarrow[FeB{{r}_{3}}]{B{{r}_{2}}}B\xrightarrow{Sn\,/\,HCl}C$ $\xrightarrow[HCl]{NaN{{O}_{2}}}D\xrightarrow[HBr]{CuBr}E$
$CH_3CH_2NH_2 + CHCl_3+ 3KOH \rightarrow (a) + (b) + 3H_2O$