Alkyl isocyanide on reduction with $\mathrm{Zn}-\mathrm{Hg}/$ $\mathrm{HCl}$ gives

 Alkyl isocyanide on reduction with $\mathrm{Zn}-\mathrm{Hg}/$ $\mathrm{HCl}$ gives N – Methyl alkanamine

Chemical reaction

 $\mathrm{RNC}\frac{\mathrm{Zn}-\mathrm{Hg}/\mathrm{HCl}}{4\left[\mathrm{H}\right]}\mathrm{R}-\mathrm{NH}-{\mathrm{CH}}_3$.