p-Dichlorobenzene has higher m.p. than those of o- and m-isomers. Discuss

Explanation

The three isomers are position isomers which differ in the relative positions of the chlorine atoms in the ring:
As we know, p-isomer is more symmetrical as compared to the other isomers. This means that in the crystal lattice, molecules of the -isomers are more closely packed as compared to the other isomers. as a result, it has a higher melting point and lower solubility as compared to ortho and meta isomers..