The electrophile in the nitration of benzene is

Which one of the following reactions does $NOT$ give benzene as the product?

Write down the conditions for a compound to possess aromaticity.

The set of meta-directing functional groups from the following sets is:

Which of the following groups possess $m-$directional effect?
$-OH, -O^{-}, -CH_3, -Cl, -NO_2, -COOH, -NHCOCH_3, -SO_3H, -Br, -COCH_3$

Credit for the ring structure of benzene goes to