Chemistry - GOC Question with Solution | TestHub

Removing ${\mathrm{H}}_1$ puts the negative charge on carbon :

Removing ${\mathrm{H}}_2$ puts the negative charge on nitrogen :

Carbon and nitrogen are in the same period, so compare electronegativity : nitrogen stabilises the negative charge better. The nitrogen anion is the more stable conjugate base, so the N-H proton ${\mathrm{H}}_2$ is more acidic.