Most commonly used freon in the industries is

The correct answer is Option (1) → Freon 12

Freons are the chlorofluorocarbon compounds of methane and ethane: very stable, unreactive, non-toxic, non-corrosive and easily liquefiable gases. Freon 12 (CCl₂F₂) is one of the most common freons in industrial use. It can be made from tetrachloromethane by the Swarts reaction (heating an alkyl chloride with a metallic fluoride):

    \( \displaystyle \ce{3CCl4 + 2SbF3 -> 3CCl2F2 + 2SbCl3} \)

NCERT (2026-27 edition):
Freons