Hyperconjugation involves delocalization of

Options

A. electrons of carbon-hydrogen `sigma` bond of an alkyl group directly attached to an atom of unsaturated system
B. electrons of carbon-hydrogen `sigma` bond of alkyl group directly attached to the positively charged carbon atom
C. `pi`- electons of carbon -carbon bond
D. lone pair of electrons

Answer

A, B

Explanation

Hyperconjugation is the delocalisation of sigma electron also known as sigma-pi conjugation. Presence of `alpha - H` with respect to double bond, triple bond or carbon containing positive charge (in carbonium ion) or umpaired electron (in free radical) is a condition for hyperconjugation.