Write isomeric amines of the formula ${\mathrm{C}}_3{\mathrm{H}}_9 \mathrm{N}$.

Which is/are correct statements?

The two amines shown differ by a factor of about $40,000$ in their ionisation constants. Which is stronger base? Explain :

The correct set of the products obtained in the following reactions

$\mathrm{RCN}\stackrel{\mathrm{reduction}}{\to }\left(\mathrm{A}\right), \mathrm{RCN}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2\mathrm{O}}{\overset{\left(\mathrm{i}\right) {\mathrm{CH}}_3\mathrm{MgBr}}{\to }}\left(\mathrm{B}\right), \mathrm{RNC}\stackrel{\mathrm{hydrolysis}}{\to }\left(\mathrm{C}\right), {\mathrm{RNH}}_2\stackrel{{\mathrm{HNO}}_2}{\to }\left(\mathrm{D}\right)$

The answer is :

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CONH}}_2\underset{{\mathrm{B}}_2}{\overset{\mathrm{NaOH}}{\to }}\mathrm{A}$,

Aqueous solution of $\mathrm{A}$