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Question

Ethyl group (CH2CH3) in ethylbenzene increases electron density at which of the following positions?

A
Ortho-Meta .
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B
Ortho-Para .
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C
Meta only.
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D
Ortho, Meta and Para.
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Solution

The correct option is B Ortho-Para .
In general, hyperconjugation effect is more dominating as compared to inductive effect, and due to hyperconjugation in ethyl benzene the electron density increases at ortho and para positions as shown :
In structure II , III and IV we can see that negative charge is delocalized at ortho and para position, so it increases the electron density at these positions .

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