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NTA Abhyas JEE Main2020ChemistryGeneral Organic ChemistryPractice

Consider the following pairs of compounds Of these pairs

Options

  1. Aboth X and Y are resonance forms
  2. Bboth X and Y are tautomeric forms
  3. CX is a resonance pair, while Y is a pair of tautomers
  4. DX is a pair of tautomers; while Y is a resonance pair

Correct answer

C. X is a resonance pair, while Y is a pair of tautomers

Step-by-step solution

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 H + occurs from N atom to O atom. Hence, 'Y' is a pair of tautomers.

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