Which of the following liquids would be expected to have the highest vapour pressure at room temperature?

Explanation

Ether has weak dispersion forces between its molecules, so a large fraction escape the surface easily and it is highly volatile, which is why it evaporates almost as soon as it is spilt. Water and glycerol are held by extensive hydrogen bonding and mercury by metallic bonding, all of which are far stronger. Vapour pressure and boiling point always run in opposite directions.