$C{H_3}N{H_2} + X + KOH \to C{H_3}NC$ (highly offensive odour)

(image) $\xrightarrow[{KCN}]{{CuCN}}P\xrightarrow{{LiAl{H_4}}}Q\xrightarrow{{HN{O_2}}}X$
Statement $I:$ Primary aliphatic amines react with $HNO _{2}$ to give unstable diazonium salts.
Statement $II:$ Primary aromatic amines react with $HNO _{2}$ to form diazonium salts which are stable even above $300 \,K$.
In the light of the above statements, choose the most appropriate answer from the options given below:
