Here's why:

* Hydrogen bonds require a hydrogen atom bonded to a highly electronegative atom like oxygen, nitrogen, or fluorine. Acetone has a carbonyl group (C=O), but the hydrogen atoms are attached to carbon atoms, which are not electronegative enough to participate in hydrogen bonding.

* Acetone can form hydrogen bonds with other molecules that have hydrogen bond donors (like water). The oxygen atom in acetone can accept a hydrogen bond from a molecule like water.

So, while acetone can participate in hydrogen bonding with other molecules, it cannot form hydrogen bonds with itself.