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NEET levelSingle correct optionDifficulty 1 of 3so094

Ethanoic (acetic) acid dimerises in benzene. The van't Hoff factor $i$ of its solution in benzene is therefore

Aless than $1$
Bequal to $1$
Cgreater than $1$
Dexactly $2$

Answer: A

Association reduces the number of particles in solution (

2 CH X_{3} COOH ⇌ (CH X_{3} COOH)_{2}

), so the observed colligative effect is smaller than calculated for non-associating molecules. Thus

i = \frac{observed}{calculated} < 1

.

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