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The p-isomer of dichlorobenzene has high...

The p-isomer of dichlorobenzene has higher melting point than O-and M-isomer. Why ?

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The melting point of para- isomer is quite higher than that of ortho or meta isomer. This is due to the fact that it has symmetrical structure and therefore its molecules can easily pack closely in crystal lattice. As a result intermolecular forces of attraction are stronger and therefore, greater energy is required to break its lattice and it melts at higher temperature.
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