$\mathrm{X}$ is $\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{N}$ (Cyanomethane)
$\mathrm{X} \stackrel{\mathrm{H}}{\longrightarrow} \mathrm{Z}$
$\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{N} \stackrel{\mathrm{H}}{\longrightarrow} \mathrm{CH}_{3} \mathrm{COOH}$
$\mathrm{Z}=\mathrm{CH}_{3} \mathrm{COOH}$
Product after mixing $\mathrm{Y}$ and $\mathrm{Z}$ is $\left(\mathrm{CH}_{3} \mathrm{COO}^{-}\right)+\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{NH}_{3}^{+}\right)$ (Substituted Ammonium Carboxylate Salt)

