JEE Main 2015 Chemistry question

Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by:

(1)Complex formation
(2)AssociationCorrect
(3)Partial ionization
(4)Dissociation

Answer: (2)

Solution

In a non-polar solvent such as benzene, acetic acid molecules pair up through two intermolecular hydrogen bonds to form a cyclic *dimer*. This halves the number of particles actually present in solution, so the observed freezing-point depression is about half of what the true molar mass would predict, and the

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Question ID VK-115358