Which of the following has least freezing point?

Depression in freezing point is a colligative property (i.e. depends only upon the number of particles of solutes). Thus, the compound which produces maximum number of
ions will have the least freezing point.
$\therefore$Concentration is same
                  $$\begin{gathered} \mathrm{Sucrose} \to \mathrm{No} \mathrm{ions} \\ \mathrm{NaCl} \to \underbrace{{\mathrm{Na}}^{+} +{\mathrm{Cl}}^{-}} \\ \mathrm{Two} \mathrm{ions} \end{gathered}$$
                 $$\begin{gathered} {\mathrm{CaCl}}_2\to \underbrace{{\mathrm{Ca}}^2+2{\mathrm{Cl}}^{-}} \\ \mathrm{Three} \mathrm{ions} \end{gathered}$$
                Glucose $\to$ No ions 
Thus, 1%  CaCl₂ will have the least freezing point.