Q.

Least stable carbocation among the following is

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a

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b

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c

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d

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answer is B.

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Detailed Solution

-OCH3 at o, p positions is an EDG….-I, +M……+M > -I

-OCH3 at meta position is an EWG …… -I only

(1) & (3), -OCH3 stabilizes the carbocation by dispersing positive charge.

In (2), -OCH3 intensifies the negative charge and destabilizes the carbocation.

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Least stable carbocation among the following is