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

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The structures of  o-Dichlorobenzene,  m-Dichlorobenzene and  p-Dichlorobenzene are given below.

                                                                   

Melting point dewpens on the crystal lattice structure We can see that p-Dichlorobenzene is a very symmetric structure thus packing of it will be maximum. As a result more and more energy will be required to break the crystal lattice of p-Dichlorobenzene. The melting point is high for p-dichlorobenzene.                     

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Devendra Khairwa

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