Question

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

• A.
• B.
• C.
• D.

Answer 1

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.