Hydrolysis of acetonitrile in acidic medium gives

• Hydrolysis of acetonitrile in acidic medium gives carboxylic acid. Another name acetonitrile is methyl cyanide. 

Chemical reaction

       ${\mathrm{CH}}_3\mathrm{CN}+{\mathrm{H}}_2\mathrm{O}\stackrel{\left[{\mathrm{H}}^{+}\right]}{⟶}{\mathrm{CH}}_3\mathrm{COOH}+{\mathrm{N}}_2$