The compound formed due to partial hydrolysis of ${\mathrm{CH}}_3\mathrm{CN}$ is

Alkane nitrile undergoes hydrolysis in 2 stages. In the first stage, the product formed is an amide and then on further hydrolysis, forms carboxylic acid as the second stage.

So, when methyl cyanide undergoes partial hydrolysis, the product formed is an acetamide.

${\mathrm{CH}}_3\mathrm{CN}\stackrel{{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}{\to }{\mathrm{CH}}_3{\mathrm{CONH}}_2$