Explanation:
(d)$\mathop {C{H_3}C{H_2}CON{H_2}}\limits_{{\text{Propionamide}}} \mathop {\xrightarrow[\begin{subarray}{l}
{\text{Hofmann}}\,{\text{bromamide}} \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{reaction}}
\end{subarray} ]{}}\limits^{B{r_2}/KOH} \mathop {C{H_3}C{H_2}N{H_2}}\limits_{{\text{Ethylamine}}} $