Here's why:

* Covalent bonds are formed when two atoms share electrons. This is the case with rubbing alcohol.

* Ionic bonds occur when one atom completely transfers an electron to another atom, creating oppositely charged ions that attract each other. Rubbing alcohol doesn't involve the complete transfer of electrons.

The molecular formula of rubbing alcohol is C3H8O. The carbon, hydrogen, and oxygen atoms share electrons to form covalent bonds within the molecule.