Explain why alkyl groups act as electron donors when attached to a $straight pi semicolon minus system.$

Solution

Alkyl group has no lone pair of electrons but it acts as an electron donor when attached to a $straight pi semicolon$ - electron system because of hyperconjugation. Carbon is slightly more electronegative than hydrogen. Thus, the carbon atom in an alkyl group has higher electron density around it as compared with an H atom. As a result, alkyl group are able to donate electrons inductively when attached to a pi system. Let us illustrate this by taking an example of propylene. The various resonating structures are as follows:

Some More Questions From Organic Chemistry – Some Basic Principles and Techniques Chapter

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Organic Chemistry – Some Basic Principles And Techniques

Explain why alkyl groups act as electron donors when attached to a $straight pi semicolon minus system.$

Some More Questions From Organic Chemistry – Some Basic Principles and Techniques Chapter

How many chain isomers are possible for pentane?

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