Why vapour pressure of acetone is less than that of ether?

The vapor pressure of acetone is lower than that of ether primarily due to differences in molecular structure and intermolecular forces. Acetone has a polar carbonyl group (C=O) that leads to stronger dipole-dipole interactions compared to the relatively weaker van der Waals forces in ether, which is a more nonpolar molecule. These stronger interactions in acetone require more energy to overcome, resulting in a lower vapor pressure. Consequently, acetone evaporates less readily than ether at the same temperature.