SELECT * FROM question_mgmt as q WHERE id=1985 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=65 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

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

Answer:

p-Dichlorobenzene is more symmetrical than o-and m-isomers. For this reason, it fits more closely than o-and m-isomers in the crystal lattice. Therefore, more energy is required to break the crystal lattice of p-dichlorobenzene. As a result, p-dichlorobenzene has a higher melting point and lower solubility than o-and m-isomers.


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