Elevation in boiling point for $1\mathrm{.}5$ molal solution of glucose in water is $4K.$ The depression in freezing point for $4\mathrm{.}5$ molal solution of glucose in water is $4K.$ The ratio of molal elevation constant to molal depression constant $(\frac{K_6}{K_4})$ is $q,4\mathrm{.}5$:$1\mathrm{.}5$