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Which one of the isomeric dichlorobenzen...

Which one of the isomeric dichlorobenzens has the highest melting point and why?

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The melting point of p-dichlorobenzene is the highest. The most symmetrical molecules of the p-isomer pack closely in the crystal lattice. As a result, the intermolecular force of attraction are much stronger. Therefore, the p-isomer melts at a temperature higher than that of the o- and m-isomers.
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CHHAYA PUBLICATION-HALOAKANES AND HALOARENES-Short Answer type (SA)
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