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Question
Which of the following compounds will have the highest melting point and why?
| (I) |  |
|
(II) |
 |
| (III) |  |
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Solution
Compound (II)
Reasons: The molecular structure of compound (II) shows that both the substituents (i.e. \[\ce{CH3}\] and \[\ce{Cl}\] are at para position. The para-isomers have higher melting points as compared to their ortho and meta-isomers. It is due to symmetry of para-isomers that fits in crystal lattice better as compared to ortho-and meta-isomers.
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