First slide
Electron Migration Effects

Which one of the following carbocation is least stable



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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