Question

What does circle inside the benzene ring indicate?

Answer 1

It implies the effective delocalisation of electrons among all C atoms.

I don't have a long answer to type in case this is a subjective question.

But that's the basic logic.

Answer 2

Answer:

it indicates that migration of electrons from one place to other place

$\huge \red⌬$

Explanation:

Petr Cech I don't know