AIIMS 2019 Chemistry Tautomerism Assertion Reason Question
Assertion: Enol form of cyclohe,⁴⁻dien one is more stable than its keto form. Reason: Keto form contains α-hydrogen atoms.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because the enol form of cyclohex-2,4-diene is stabilized by intramolecular hydrogen bonding and resonance, making it more stable than the keto form. However, the reason is false; while the keto form does contain α-hydrogens, their presence does not directly explain the stability of the enol form. Option A is incorrect because the reason does not correctly explain the assertion, while option C is incorrect as both statements are true. Option D is incorrect since the assertion is indeed true.
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