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

σ → p (empty) and σ → π * electron delocalisations
σ → σ * and σ → π electron delocalisations
σ → p (filled) and σ → π electron delocalisations
p (filled) → σ → π * electron delocalisations

Correct answer: σ → p (empty) and σ → π * electron delocalisations

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