The vapour pressure in mm of $Hg,$ of an aqueous solution obtained by adding 18 g of glucose $(C_6H_{12}O_6)$ to $180\;g$ of water at $100^{\circ}$ is :

Question

$$\begin {array} {1 1}(a)\;7.60 \\ (b)\;76.0 \\ (c)\;759 \\ (d)\;752.4 \end {array}$$