The osmotic pressure of a solution of benzoic acid dissolved in benzene is less than expected because

benzoic acid is an organic solute

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benzene is a non-polar solvent

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benzoic acid dissociates in benzene

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benzoic acid gets associated in benzene

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Solution

The correct option is C benzoic acid gets associated in benzene
Molecular weight of benzoic acid in benzene is determined by the depression in freezing point method and comes out to be 244.The actual molecular mass is 122.Therefore,it corresponds to the dimers which are formed by hydrogen bonding.
And because of this, osmotic pressure of become half.

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