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Question

Which one of the following carbocation is most stable?

A
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B
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C
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D
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Solution

The correct option is C

is most stable because +R group present at p(or o) position increases the stability of benzyl carbocation and R group decreases stability. As CH3 is +R group since it provides electron for delocalisation, it will increase the stability of carbocation at ortho and para position whereas NO2 is R group, it will decrease the stability of carbocation.
Hence, c is the correct option.

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