First slide

Electron Migration Effects

Question

Which one of the following carbocation is least stable

Moderate

A
B
C
D

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 :
$- {NO}_{2} - CN . . . . - I, - M . . . EWG; (- CN < - {NO}_{2}) - {CH}_{3} . . . . + I, + R . . . EDG; ∴ stability of$

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