JEE Advanced 2013 Chemistry question

The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to

(A) (empty) and electron delocalisations.Correct
(B) and electron delocalisations.
(C) (filled) and electron delocalisations.
(D)p (filled) and electron delocalisations.

Answer: (A)

Solution

Hyperconjugation is the delocalisation of electrons from an adjacent C–H σ bond into a neighbouring vacant or antibonding orbital. In the tert-butyl cation the positive carbon has an empty p orbital, so the C–H σ electrons delocalise into this empty p orbital (,

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Question ID VK-026156