Write a chemical reaction useful to prepare the following: Freon-12 from carbon tetrachloride.

Explanation

Freon-12 is prepared by the action of hydrogen fluoride on carbon tetrachloride in the prsence of catalylic amount of antimony pentachloride. This is called swartz reaction.
`underset("Carb on tetrachloride")(C Cl_(4))+2HF overset(SbCl_(5))to underset("Freon-12")(2HCl)+C Cl_(2)F_(2)`.