The reason why the freezing‐point depression of benzoic acid in benzene is twice what we would expect for the molecular formula, C7H6O2 is due to dimmerization of the acid.
Benzoic acid (C7H6O2) is capable of intermolecular hydrogen bonding. This occurs because of the polar 0-H groups in the molecule.
As a result of this, the molecule forms dimmers in benzene as shown in the image attached.
The existence of these dimmers increases the molecular mass of benzoic acid to give 244 instead of 122.
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