Question

Tautomerism is exhibited by

• A. All the four
• B. II, III and IV
• C. I, III and IV
• D. None of these

Answer 1

Answer: (C)

I, III and IV

Answer 2

I^st is enolic form which always show tautomerism III and IV containing a-H atom so they show tautomerism.

But in II structure a-H atom present on unsaturated carbon so it can’t show tautomerism