Which one of the following carbocation is least stable

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answer is B.

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Detailed Solution

Charge dispersal leads to stability; EDG disperse positive charge and increases the stability of carbocation;EWG intensify positive charge and decreases the stability of carbocation;At para position : -NO2-CN ....-I, -M . . . EWG; (-CN<-NO2) -CH3 . . . . +I, +R . . . EDG; ∴ stability of

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