JEE Advanced2013ChemistryGeneral Organic ChemistryActual
The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, due to
Options
- Aσ → p (empty) and σ → π * electron delocalisations.
- Bσ → σ * and σ → π electron delocalisations.
- Cσ → p (filled) and σ → π electron delocalisations.
- Dp (filled) → σ * and σ → π * electron delocalisations.
Correct answer
A. σ → p (empty) and σ → π * electron delocalisations.
Step-by-step solution
In tert-butyl cation, carbon bearing ⊕ charge has one vacant p orbital hence it is σ - p (empty) conjugation or Hyperconjugation. In 2-butene hyperconjugation between σ and π * bond.