Assertion : Alkyl isocyanides in acidified water give alkyl formamides

Reason : In isocyanides, carbon first acts as a nucleophile then acts as an electrophile.

In an isocyanide, first an electrophile added to the carbon followed by a nucleophile addition. When alkyl cyanide treated with acidified water, the product undergoes a transformation and the final product becomes an alkyl formamide.

$\begin{array}{l}\mathrm{R}\stackrel{+}{\mathrm{N}}\equiv \overline{\mathrm{C}}+{\mathrm{E}}^{+}⟶\mathrm{R}\stackrel{+}{\mathrm{N}}\equiv \mathrm{CE}\stackrel{\mathrm{Nu}}{\to }\mathrm{RN}\equiv \mathrm{C}\left(\mathrm{Nu}\right)\mathrm{E}\\ \mathrm{R}\stackrel{+}{\mathrm{N}}\equiv \overline{\mathrm{C}}+{\mathrm{H}}_2\mathrm{O}⟶\mathrm{RN}=\mathrm{CHOH}⟶\underset{\mathrm{Alkyl} \mathrm{formamide}}{\mathrm{RNHCHO}}\end{array}$