1. Tardigrade
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  3. Chemistry
  4. Assertion 2-butenal lacks enolisable H-atom, α to carbonyl group, still it has sufficient acidic character. Reason The conjugate base of 2-butenal is stabilised by resonance.

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Q. 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 stabilised by resonance.

AIIMSAIIMS 2009

Solution:

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