Question

What is hyper conjugation? Write the relativity order.

Answer 1

Hyperconjugation is the interaction of the electrons in a sigma bond (usually C–H or C–C) with an adjacent empty (or partially filled) non-bonding p-orbital, antibonding σ or π orbital, or filled π orbital, to give an extended molecular orbital that increases the stability of the system.

The relative stability of alkenes on the basis of hyperconjugation has the order:
CH2=CH2 < CH3-CH=CH2 < CH3-CH=CH-CH3

Hyperconjugation can take place through the overlap of sigma orbital of alkyl group and the empty p orbital of carbocation.