Chemistry - GOC Question with Solution | TestHub

In 'X' pair of compounds, delocalization of electrons occurs without the change in the relative position of bonded atoms (or nuclei). Hence, X is a resonance pair.

In Y pair of compounds, shifting of proton$\left({\mathrm{H}}^{+}\right)$occurs from N atom to O atom. Hence, 'Y' is a pair of tautomers.