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2 Chemistry -- Haloarenes

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

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

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The melting point of p-isomers of dichloro benzene is higher than that of o- and m-isomers. This is because, p-isomer has symmetrical structure and therefore, its molecule can easily pack closely in crystal lattice. Hence, it has stronger intermolecular forces of attraction than o- and m- isomers. Therefore, greater energy is required to break the intermolecular forces to melt or dissolve the p-isomer than the corresponding o- and m- isomers. In other words, the melting point of p-isomer is higher and its solubility is lower than the corresponding o- and m-isomers.

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