Maximum depression in freezing point is caused by

Identify the compound amongst the following whose $0.1 \ M$ aqueous solution has the highest boiling point.

Which of the following is a non-electrolyte?

$A$ sample of water is found to contain $5.85 \% \left(\frac{w}{w}\right)$ of $AB$ (molecular mass $58.5$) and $9.50 \% \left(\frac{w}{w}\right)$ $XY_2$ (molecular mass $95$). Assuming $80 \%$ ionisation of $AB$ and $60 \%$ ionisation of $XY_2$, the freezing point of the water sample is: [Given, $K_f$ for water $= 1.86 \ K \ kg \ mol^{-1}$, freezing point of pure water $= 273 \ K$ and $A, B, X, Y$ are monovalent ions.] (in $K$)

Find the expected value of $\Delta T_{b}$ for $1 \ m \ AlCl_3$ solution in water if a solution of a nonelectrolyte of the same concentration has a $\Delta T_{b}$ value of '$x$' $K$.

Assuming $100\%$ dissociation of $1 \ m$ $KCl$ solution in water,the freezing point of the solution will be ........ $^oC$. $(K_f = 1.86 \ K \ kg \ mol^{-1})$