Question

what is hyperconjugation?explain with eg. of propene.

Answer 1

Hyperconjugation :- It 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, anti bonding σ or π orbital, or filled π orbital, to give an extended molecular orbital that increases the stability of the system. .
For example in propene molecule, Hyper conjugation arise due to partial overlap of sp 3-s sigma bond orbital and the empty p-orbital of an adjacent carbon atom. Here one of the carbon-hydrogen bonds of methyl group can lie in the plane of pi-bond orbital, hence partial overlap with pi-bond orbital. This results the delocalization of pi-electrons and increase the stability of molecule.

Answer 2

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❥The delocalisation electron due to overlap between a p- orbital and sigma bond from alpha carbon hydrogen bond is called hyperconjugation.