Question

Orbital interaction between the sigma bond of a substituent group and a neighbouring pi orbital is known as

• A. Hyperconjugation
• B. Inductive effect
• C. Steric effect
• D. Electric quadruple interactions

Answer 1

The correct option is A Hyperconjugation

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.