(d)
When amide is heated with a mixture of $Br_{2}$ in the presence of NaOH or KOH amine is formed which has one carbon atom less than original amide. This is called Hofmann’s degradation reaction.
Hexanamide$+ Br_{2} + 4KOH \rightarrow Pentanamine + K_{2}CO_{3} + 2KBr + 2H_{2}O$