The Van't Hoff factor calculated from association data is always ... than calculated from dissociation data.

Which of the following expressions correctly defines the Van't Hoff factor $i$?

When substance $A$ is dissolved in solvent $B$,it associates to form $A_3$. The van't Hoff factor $i$ is:

$20 \ g$ of naphthoic acid $(C_{11}H_8O_2)$ $(M_w = 172 \ g/mol)$ is dissolved in $50 \ g$ of benzene. The freezing point depression of $2 \ K$ is observed for the solution. The Van't Hoff factor $(i)$ will be ($K_f$ for benzene $= 1.72 \ K \ kg \ mol^{-1}$)

If a solute associates in a solvent, its experimentally calculated molar mass using the boiling point elevation method will be

Phenol dimerised to $60\%$ in a solvent. The observed molecular weight of phenol will be