Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

→ The chlorofluorocarbon compounds of methane and ethane are collectively known as freons.
→ They are extremely stable, unreactive, non-toxic, non- corrosive and easily liquefiable gases.
→ Freon 12 (CCl₂F₂) is one of the most common freons in industrial use.
→ It is manufactured from tetrachloromethane by Swarts reaction.
→ These are usually produced for aerosol propellants, refrigeration and air conditioning purposes.
→ By 1974, total freon production in the world was about 2 billion pounds annually.
→ Most freon, even that used in refrigeration, eventually makes its way into the atmosphere where it diffuses unchanged into the stratosphere.
→ In stratosphere, freon is able to initiate radical chain reactions that can upset the natural ozone balance.