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

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When an alkyl group is attached to a π system, it acts as an electron-donor group by the process of hyperconjugation. To understand this concept better, let us take the example of propene. 

This type of overlap leads to a delocalisation (also known as no-bond resonance) of the π electrons, making the molecule more stable. 

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