Here's why:

* Naphthalene is a solid hydrocarbon, commonly found in mothballs. It's combustible, but not explosive on its own.

* Acetone is a solvent, commonly used in nail polish remover. It's flammable, but not explosive on its own.

While mixing them might create a flammable mixture, it doesn't form an explosive compound.

Important Note:

* Flammable mixtures are dangerous! A mixture of naphthalene and acetone can easily ignite, especially if exposed to a heat source or flame.

* Never attempt to mix chemicals without proper safety precautions and knowledge.

If you have any further questions about chemical reactions or safety, please consult a qualified chemist or safety professional.