Question

Hyperconjugation is best described as

• A. delocazation of $\pi$ - electrons in nearby empty orbitals
• B. delocaliztion of $\sigma$ - electrons into an adjacent empty p-orbital or partially filled p-orbital or $\pi$ bond
• C. the effect of alkyl groups donating a small amount of electron density into a nearby p-orbital
• D. delocalization of lone pair electrons in nearby empty orbitals

Answer 1

The correct option is B delocaliztion of $\sigma$ - electrons into an adjacent empty p-orbital or partially filled p-orbital or $\pi$ bond

Delocalisation of electron with the participation of bonds of primarily sigma character is known as hyperconjugation. It involves the interaction of σ electrons with the adjacent molecular orbitals. In hyperconjugation, $\sigma$ - electrons are delocalised into p-orbital of $\alpha$ - carbon involved in $\pi$ - bonding.