Which of the following isomer has the highest melting point?

o-Dichlorobenzene

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p-Dichlorobenzene

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m-Dichlorobenzene

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All have the same melting point

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Solution

The correct option is B p-Dichlorobenzene
p-Dichlorobenzene (or 1,4-dichlorobenzene) has the highest melting point among its ortho and meta isomers. This is because it fits better in its crystal lattice than the other two isomers owing to its symmetry.

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