JEE Main Chemistry question

Statement 1: 2,3-Dimethylbut-2-ene is more stable than but-2-ene. Statement 2: Twelve hyperconjugative (no-bond resonance) structures can be written for 2,3-dimethylbut-2-ene, while but-2-ene has only six.

(A)Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1Correct
(B)Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
(C)Statement 1 is True, Statement 2 is False
(D)Statement 1 is False, Statement 2 is True

Answer: (A)

Solution

2,3-Dimethylbut-2-ene, (CH)C=C(CH), has four methyl groups on its double bond, each contributing 3 -hydrogens available for hyperconjugation, giving hyperconjugative structures. But-2-ene, CHCH=CHCH, has only two methyl groups, giving

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Question ID VK-142350