Hyperconjugation
When a H-C bond is attached to a double or triple bond in an unsaturated hydrocarbon, the sigma electrons of the H-C bond interact or enter into conjugation with the unsaturated system.
The interactions with between electrons of π systems (multiple bonds) and the adjacent sigma bonds (single H-C bonds) of the substituent groups in organic compounds is called hyperconjugation.
According to this concept, if an alkyl group carrying at least one hydrogen atom is attached to a unsaturated carbon atom, it releases electrons of carbon-hydrogen single bond towards the multiple bonds.
Hyperconjugation effect is similar to resonance effect.
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