Dimer of acetic acid in benzene is in equilibrium with acetic acid at a particular condition of temperature and pressure. If half of the dimer molecules are hypothetically separated out then

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Osmotic pressure of the solution reduces

Freezing point of the solution reduces

Boiling point of the solution reduces

Vapour pressure of the solution reduces

answer is A, C.

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Detailed Solution

Acetic acid undergoes dimerization as $2 {CH}_{3} COOH ⇌ {({CH}_{3} COOH)}_{2}$
Since i < 1
$∴$ Osmotic pressure decreases and boiling point also decreases as α and ( $∆$ Tb) both are colligative properties.

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