Question

Which of the following can show tautomerism?

• A. (i), (ii) and (iii)
• B. (i), (ii), (iii), and (iv)
• C. only (i) and (ii)
• D. only (ii) and (iv)

Answer 1

The correct option is A (i), (ii) and (iii)

To show tautomerisation, there should be atleast one $\alpha -$H. No $\alpha -$H is there in (iv), so it does not show tautomerisation.