JEE Main Chemistry question

Benzoic acid shows an abnormally high molar mass when its molar mass is determined using a colligative property in benzene solution. This is because [Jamia Millia Islamia 2008]

(A)Benzoic acid is an organic solute
(B)Benzoic acid has higher molar mass than benzene
(C)Benzoic acid gets associated in benzeneCorrect
(D)Benzoic acid gets dissociated in benzene

Answer: (C)

Solution

In the non-polar solvent benzene, benzoic acid molecules dimerise through intermolecular hydrogen bonding between pairs of groups, effectively associating two molecules into one kinetic unit. This

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Question ID VK-143114