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+I Effect

Which of the ...

Question

Which of the following is the most stable arenium or benzenium ion?

A

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B

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C

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D

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Solution

The correct option is B
$N O_{2}$ is a -R group which will reduce the electron density at para and ortho position and destabilise the carbocation intermediate formed. In all the given compound, formed intermediate is destabilised by $N O_{2}$ group.
But in compound (b), positive charge is comparitively more stabilised due to +I effect of $C H_{3}$ group.

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