MCQ
The following compounds do not show ketoenol tautomerism, except:
- A
- ✓
- C
- D
✓
Answer
Correct option: B.
(b)
Explanation: For keto-enol tautomerism, a compound must have at least one acidic $\alpha$-hydrogen. So acetophenone (A) shows tautomerism. Benzaldehyde (B) and benzophenone (C) do not show tautomerism due to lack of $\alpha$-hydrogen. p-Benzoquinone (D) contains $\alpha$-hydrogens but they are not acidic because they are present on a double bond. Therefore, it does not show ketoenol tautomerism.
Explanation: For keto-enol tautomerism, a compound must have at least one acidic $\alpha$-hydrogen. So acetophenone (A) shows tautomerism. Benzaldehyde (B) and benzophenone (C) do not show tautomerism due to lack of $\alpha$-hydrogen. p-Benzoquinone (D) contains $\alpha$-hydrogens but they are not acidic because they are present on a double bond. Therefore, it does not show ketoenol tautomerism.
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