$o, p-$ directing groups are mostly

Assertion : Nitrating mixture used for carrying out nitration of benzene consists of conc. $HNO_3 +$ conc. $H_2SO_4$.
Reason : In presence of $H_2SO_4$,$HNO_3$ acts as a base and produces $NO_2^+$ ions.

Which of the following is a heterocyclic aromatic compound?

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

The major product obtained in the given reaction is:

Which compound possesses the highest dipole moment?