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

Answers (1)

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

                                                                   

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 bonds (during boiling). Thus boiling point is high for p-Dichlorobenzene.                     

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