\(\underset{(C)}{\mathop{\begin{matrix}
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|| \\
C{{H}_{3}}-C{{H}_{2}}-C-N{{H}_{2}} \\
\end{matrix}}}\,\) \(\xrightarrow[\begin{smallmatrix}
Hofmann's\,\,broamide \\
reaction
\end{smallmatrix}]{B{{r}_{2}}\,,\,KOH}\) \(C{{H}_{3}}-C{{H}_{2}}-N{{H}_{2}}\)
image
$\mathop {C{H_3} - C{H_2} - N{H_2}}\limits_{\mathop 2\limits } \,$$\,\mathop {{{(C{H_3})}_2}NH}\limits_{\mathop 3\limits } $
$\mathop {C{H_3} - \mathop {\mathop C\limits^{||} }\limits^O - N{H_2}}\limits_4 $
$RCN{\mkern 1mu} \xrightarrow{{reduction}}{\mkern 1mu} (a),$
$RCN{\mkern 1mu} {\mkern 1mu} \mathop {\xrightarrow{{(i){\kern 1pt} C{H_3}MgBr}}}\limits_{(ii){\kern 1pt} {H_2}O} {\mkern 1mu} (b),$
$RNC{\mkern 1mu} {\mkern 1mu} \xrightarrow{{hydrolysis}}{\mkern 1mu} {\mkern 1mu} (c),{\mkern 1mu} $
$RN{H_2}{\mkern 1mu} \xrightarrow{{HN{O_2}}}{\mkern 1mu} {\mkern 1mu} (d)$
${image}$