Which of the following statements is correct?

Benzene readily docolourises dilute ${\mathrm{KMnO}}_4$ solution.

The inductive effect is the only factor which decides the orientation effects in the monosubstituted benzene.

The number of isomers of aromatic compound tribromobenzene is four

The dipole moment of p-nitrotoluene is expected to be larger than p-chloronitrobenzene.