Q42 / 170 · Manipal (MET) 2016 · Chemistry

van't Hoff factor, when benzoic acid is dissolved in benzene, will be

A
$2$
B
$1$
Correct answer
C
$0.5$
D
$1.5$

Solution

When benzoic acid dissolve in benzene, it will be dimerise due to the intermolecular hydrogen bonding. $2 \mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH} \xrightarrow{\text { Benzene }}\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}\right)_2$

$=\frac{1}{2}=0.5$

Hence, the correct answer is option: 'C'.

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