Question

Why p-dichlorobenzene has higher melting point than o-and m-isomer?

Answer 1

Answer:

p-Dichlorobenzene is more symmetrical than o-and m-isomers. For this reason, it fits more closely than o-and m-isomers in the crystal lattice. Therefore, more energy is required to break the crystal lattice of p-dichlorobenzene. As a result, p-dichlorobenzene has a higher melting point than o-and m-isomers...........................

Answer 2

$\huge\textcolor{red}{\texttt{Answer :-}}$

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

This is because p-isomer is more symmetrical and hence magnitude of molecular forces of attraction are stronger, therefore, the p-isomer melts at a higher temperature and has comparatively more solubility.