Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question
Gujarat BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes2 Marks
Question
Write note on freons.
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Answer
$\rightarrow$ The chlorofluorocarbon compounds of methane and ethane are collectively known as freons.
$\rightarrow$ They are extremely stable, unreactive, non$-$toxic, non$-$corrosive and easily liquefiable gases.
$\rightarrow$ Freon $12 (CCl_2F_2)$ is one of the most common freons in industrial use.
$\rightarrow$ It is manufactured from tetrachloromethane by Swarts reaction.
$\rightarrow$ These are usually produced for aerosol propellants, refrigeration and air conditioning purposes.
$\rightarrow$ By $1974,$ total freon production in the world was about $2$ billion pounds annually.
$\rightarrow$ Most freon, even that used in refrigeration, eventually makes its way into the atmosphere where it diffuses unchanged into the stratosphere.
$\rightarrow$ In stratosphere, freon is able to initiate radical chain reactions that can upset the natural ozone balance.
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