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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?

Text Solution

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(a) p-dichlorobenzene have higher melting point than ortho and meta isomer. This is because the para isomer is higher a symmetrical structure and therefore, its packing is more efficient as compared to the ortho and meta isomer, therefore, it shows higher melting point.

(b) The (±)-Butan-2-olisopticallyinactive because it exist in two enantiomeric forms which are non-superimposable mirror images of each other. Both the isomers are present in equal amounts therefore, it does not rotates the plane of polarized light and is optically inactive.
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Knowledge Check

  • Assertion The p - isomer of dichlorobenzene has higher m.p than o-and m isomer Reason p-isomer is symmetrical and thus shows more closely packed structure .

    A
    If both assertion and reason are true and the reasone is the correct explanation of the assertion .
    B
    If both assertion and reason are true but reason is the correct explanation of the assertion .
    C
    If assertion is true but reasone is false
    D
    If assertion is false but reason is true .

  • Assertion : The p-isomer of dichlorobenzene has higher melting point than o- and m-isomer. Reason : p-isomer is symmetrical and thus shows more closely packed strucure.

    A
    If assertion is true but the reason is false
    B
    If assertion is false but reason is true
    C
    If both assertion and reason are true and the reason is the correct explanation of assertion
    D
    If both assertion and reason are true and the reason is not the correct explanation of assertion

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