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Which one of the isomeric dichlorobenzen...

Which one of the isomeric dichlorobenzens has the highest melting point and why?

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The melting point of p-dichlorobenzene is the highest. The most symmetrical molecules of the p-isomer pack closely in the crystal lattice. As a result, the intermolecular force of attraction are much stronger. Therefore, the p-isomer melts at a temperature higher than that of the o- and m-isomers.
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Knowledge Check

  • Which one of the following elements has the highest melting point -

    A
    He
    B
    Ne
    C
    Kr
    D
    Xe

  • Which one has the highest boiling point-

    A
    Kr
    B
    Xe
    C
    He
    D
    Ne

  • Which one of the following compounds has the highest boiling point-

    A
    `CH_(3)CH_(2)CH_(2)Cl`
    B
    `CH_(3)CH_(2)CH_(2)CH_(2)Cl`
    C
    `CH_(3)CH(CH_(3))CH_(2)Cl`
    D
    `(CH_3)_(3)C Cl`

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