Write any two methods for the preparation of alkyl isocyanides?

Ethyl isocyanide on hydrolysis in acidic medium gives methylamine salt and ethanoic acid.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Benzyl amine cannot be prepared by

Ethyl isocyanide on hydrolysis in acidic medium generates:

Ethyl isocyanide on hydrolysis in acidic medium generates

Identify compounds A,B and C in the following sequence of reactions.

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{NC}\stackrel{\mathrm{HgO}}{\to } \mathrm{A} \stackrel{{\mathrm{H}}_2\mathrm{O}}{\to } \mathrm{B} \underset{\mathrm{ii}){\mathrm{H}}_2\mathrm{O}}{\overset{\mathrm{i}){\mathrm{NaNO}}_{2 }/ \mathrm{HCl} }{\to }}$