Question

The value of van ’t Hoff factor (i) for a solution of ethanoic acid in benzene is:

• A. 2
• B. 0.5
• C. 1
• D. 1.5

Answer 1

The correct option is B 0.5

In benzene, two molecules of ethanoic acid associate to form a dimer.
$2C{H}_{3}COOH\rightleftharpoons (C{H}_{3}COOH{)}_2$
van't hoff factor i = $\frac{\text{number of solute particles in solution}}{\text{theoritical number of solute particles}}$
$i=\frac{1}{2}=0.5$