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(a) Why does p-dichlorobenzene have a hi...

(a) Why does p-dichlorobenzene have a higher m.p than its o-and m-isomers?
(b) Why is (`pm`) - Butan -2 - ol of is optically inactive?

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Butan-2-ol represents racemie mixture of(+)-butan-2-oland-butan-2-ol which rotate the plane polarised light in different directions but to equal extent. Therefore, (t) compound is optically inactive.
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