Question

Which of the following best define the term hyperconjugation ?

• A. Transfer of H from ${\sigma }_{C-H}$bond to the $\pi$ system.
• B. Participation of an H-atom on terminal carbon in the electron sharing.
• C. Delocalisation of electron density from a proper oriented $\sigma$-bond into $\pi$ system.
• D. Interaction between a' properly aligned, electron pair with the empty $\pi$ system.

Answer 1

The correct option is A Transfer of H from ${\sigma }_{C-H}$bond to the $\pi$ system.

Hyperconjugation involve delocalisation of $\sigma$-electrons with adjacent pi-system.

It involves delocalisation of σ electrons of C—H bond of an alkyl group directly attached to an atom of unsaturated system or to an atom with an unshared p orbital.