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Chemistry · 2023 · 2 marks
Haloalkanes and HaloarenesPhysical Properties of Haloalkanes and Haloarenes2 marksUnderstandvery short answer
CBSE 2023 · Region 5 · Set 1 · Q22
Why is boiling point of o-dichlorobenzene higher than p-dichlorobenzene but melting point of para isomer is higher than ortho isomer?
Why is boiling point of o-dichlorobenzene higher than p-dichlorobenzene but melting point of para isomer is higher than ortho isomer?
Marking-scheme solution
B. P. of o-isomer is higher as it has higher dipole moment or polarity / stronger intermolecular interactions.
M. P. of p-isomer is higher as it is symmetric and fits better in the crystal lattice.
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.