Q.

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

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a

σ→p empty  and  σ→π*  electron  delocalissations

b

σ→σ*   and  σ→π  electron  delocalissations

c

σ→p filled   and  σ→π  electron  delocalisations

d

p filled  → σ* and σ →π*  electron  delocalisations

answer is A.

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Detailed Solution

In tert -butyl cation, carbon bearing positive charge has one vacant p-orbital hence it is σ−p (empty) conjugation or hyperconjugation.In 2-butene, hyperconjugate is between σ−π*  bond.
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The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to