Acetone, with the chemical formula CH3COCH3, is a colorless liquid ketone. It is the simplest and smallest ketone. Acetone is miscible with water and many organic solvents.

An ionic compound is composed of ions, which are atoms or molecules that have lost or gained electrons, resulting in a net electric charge. In contrast, a molecular compound is composed of molecules, which are neutral groups of atoms held together by covalent bonds. The difference between ionic and molecular compounds lies in the nature of the chemical bonds that hold them together.

Acetone is a molecular compound because it is composed of molecules made up of neutral atoms connected by covalent bonds. The carbon-carbon and carbon-oxygen bonds in acetone are covalent bonds, meaning that electrons are shared between the atoms to form stable bonds.

In summary, acetone is a molecular compound due to its composition of molecules held together by covalent bonds, not ions.