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Which of the following carbocations is expected to be most stable?
Explanation
The carbocation farthest from the electron-withdrawing $-NO_2$ is most stable.
Detailed Solution
$-NO_2$ group exhibits –I effect and it decreases with increase in distance.
In the first structure the positive charge is present on the C-atom at maximum distance from $-NO_2$, so the –I effect reaching it is minimum and stability is maximum.