Here's why:

* Lack of free electrons: Kerosene is a hydrocarbon, meaning it's composed of hydrogen and carbon atoms. These atoms are tightly bound together in molecules, and there are very few free electrons available to carry an electrical current.

* High resistivity: Kerosene has a very high electrical resistance, meaning it strongly resists the flow of electricity.

* Use in electrical equipment: Kerosene is often used as an insulating fluid in electrical transformers and other equipment, further demonstrating its insulating properties.

However, it's important to note:

* Impurities: While pure kerosene is an excellent insulator, the presence of impurities, like water or dissolved salts, can significantly reduce its resistance and make it more conductive.

* High voltage: Under extremely high voltages, even kerosene can break down and become conductive.

Overall, kerosene is primarily an insulator, but its conductivity can be influenced by factors like impurities and voltage levels.