Write the steps involved in the coupling of Benzenediazonium chloride with aniline and phenol.

Write IUPAC name of the following compound:

Account for the following:

Reduction of alkyl cyanide forms primary amine whereas alkyl isocyanide forms secondary amine.

Complete the following conversion.

${\mathrm{CH}}_3\mathrm{NC}+ \mathrm{HgO}\to ?$

Complete the following conversion.

$? + 2{\mathrm{H}}_2\mathrm{O} \to {\mathrm{CH}}_3{\mathrm{NH}}_2+\mathrm{HCOOH}$.