Which of the following compounds is an example of Freon?

Freons are chlorofluorocarbons (CFCs) — compounds containing carbon, chlorine, and fluorine atoms.

Among the options:

C$$_2$$H$$_2$$F$$_2$$ — contains H, no Cl (not a Freon)

C$$_2$$F$$_4$$ — contains only F, no Cl (not a Freon, this is a perfluorocarbon)

C$$_2$$HF$$_3$$ — contains H, no Cl (not a Freon)

C$$_2$$Cl$$_2$$F$$_2$$ — contains both Cl and F (this is a Freon)

The correct answer is C$$_2$$Cl$$_2$$F$$_2$$.