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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 structure
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 structure
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Solution
The correct option is A Assertion is true, Reason is true and Reason is correct explanation for Assertion
Generally, the melting point of para isomer is quite higher than that of ortho or meta isomers. This is due to the fact that it has a symmetrical structure and therefore, its molecules can easily pack closely in the crystal lattice. As a result, intermolecular forces of attraction are stronger and therefore, greater energy is required to break its lattice and its melts at higher temperature.
Generally, the melting point of para isomer is quite higher than that of ortho or meta isomers. This is due to the fact that it has a symmetrical structure and therefore, its molecules can easily pack closely in the crystal lattice. As a result, intermolecular forces of attraction are stronger and therefore, greater energy is required to break its lattice and its melts at higher temperature.
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