Chemistry - GOC Question with Solution | TestHub

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

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

Nitrogen and oxygen are in the same period, so the deciding factor is electronegativity. Oxygen holds the negative charge better, so the alkoxide is the more stable conjugate base and the O-H proton ${\mathrm{H}}_2$ is more acidic.