Question

Hyperconjugation involves delocalization of. 

(i) Electrons of carbon-hydrogen σ bond of an alkyl group directly to an atom of unsaturated system. 

(ii) Electrons of carbon-hydrogen σ bond of an alkyl group directly attached to the positively charged carbon atom. 

(iii) π-electron of carbon-carbon bond. 

(iv) Lone pair of electrons.

Answer 1

(i), (ii) Hyperconjugation, also known as sigma-pi conjugation, is the delocalization of sigma electrons. Presence of αH with respect to double bond, triple bond or carbon containing positive charge (in carbonium ion) or unpaired electron (in free radical) is a condition required for hyperconjugation.