Gabriel phthalimide synthesis exclusively forms primary amines only. Explain.

Give the structures of $\mathrm{A}$, $\mathrm{B}$ and $\mathrm{C}$ in the following reaction.

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{N}}_2\mathrm{Cl}\stackrel{\mathrm{CuCN}}{\to }\mathrm{A}\stackrel{{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}{\to }\mathrm{B}\underset{∆}{\overset{{\mathrm{NH}}_3}{\to }}\mathrm{C}$.

Write IUPAC name of the following compound:

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{NH}{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$.