Question

The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to
(a) $\sigma \rightarrow p$ (empty) and $\sigma \rightarrow \pi^*$ electron delocalisations
(b) $\sigma \rightarrow \sigma^*$ and $\sigma \rightarrow \pi$ electron delocalisations
(c) $\sigma \rightarrow p$ (filled) and $\sigma \rightarrow \pi$ electron delocalisations
(d) $p (filled) \rightarrow \sigma^*$ and $\sigma \rightarrow \pi^*$ electron delocalisations

Answer 1

Correct option will be A .

The  stabilities of tertiary-butyl cation and 2- butene, will be due to following delocalization .

σ - - - - - - - - - > p (empty) and  

σ - - - - - - - - - - > π∗ electron delocalizations