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Q.
Consider the following pairs of compounds
Of these pairs
NTA AbhyasNTA Abhyas 2022
Solution:
In '$X$' pair of compounds, de-localisation 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 $\left(H^{+}\right)$ occurs from $N$ atom to $O$ atom. Hence, '$Y$' is a pair of tautomers.
