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Explain why alkyl groups act as electron...

Explain why alkyl groups act as electron donors when attached to a n system

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Alkyl group has no lone pair of electrons but it acts as an electron donor when attached to a `pi`-electron system because of hyper conjugation. Let us illustrate by toluene in which methyl `(CH_(3))` group is attached to a benzene ring containing three pi-electrons in the alternate positions. the various resonating structures are as follows :
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