d
(d) Because $N-N$ dimethyl propanimine
$\mathop {\mathop {\mathop {C{H_3} - N - C{H_2} - C{H_2} - C{H_3}}\limits^{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} }\limits^{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} }\limits_{{3^o}{\text{ amine}}} $
$N-$ Methyl anline $\to $ image
Anlime $\to$ $1^o$ amine.
