MEDIUMMCQ SINGLENEET ChemistryOrganic ChemistryAldehydes and ketonesPrevious Year Questions
Assertion(A) 2-butenal lacks enolisable H-atom, α to carbonyl group, still it has sufficient acidic character. Reason(R) The conjugate base of 2-butenal is stabilized by resonance. (AIIMS 2009)
A.Both A and R are correct and R is the correct✓ Correct
B.Both A and R are correct but R is not the correct
C.A is correct but R is incorrect
D.Both A and R are incorrect
Explanation
2-butenal contains γ-H atoms and the conjugate base obtained after the removal of γ-H-atom, is stabilized by resonance. Hence, 2-butenal is sufficiently acidic. However it lacks enolisable H-atom, α to carbonyl group.
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