question_answer

Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as

Assertion 2-butenal lacks enolisable H-atom, \[\alpha \] to carbonyl group, still it has sufficient acidic character. Reason The conjugate base of 2-butenal is stabilized by resonance.

A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C) If Assertion is true but Reason is false.

D) If both Assertion and Reason are false.

Correct Answer: D

Solution :

2-butenal contains \[\gamma -H\]atoms and the conjugate base obtained after the removal of \[\gamma -H\]atom, is stabilized by resonance. Hence, 2-butenal is sufficiently acidic, however, it lacks enolisable H-atom \[\alpha \] to carbonyl group.