Properties Of Benzene

Toluene is most readily sulphonated among these because
methyl group is electron donating (+ I effect), activate benzene
ring for electrophilic aromatic substitution.

p-dichlorobenzene is non-polar.
The two dipole vectors cancelling each other giving zero
resultant dipole moment, o-dichlorobenzcne has greater
dipole moment than meta isomer.
Toluene is less polar than both ortho and para
dichlorobenzene. Therefore, the increasing order of dipole
moment is
p-dichlorobenzene < toluene < m-dichlorobenzene
< o-dichlorobenzene