Question

Formula for Freon-112 gas will be:
A. ${C_2}{F_2}C{l_4}$
B. $C{F_2}C{l_2}$
C. $CFC{l_3}$
D. $CC{l_2}F$

Answer 1

Hint: Freon gas is commonly called chlorofluorocarbons. It is one of the greenhouse gases, chlorofluorocarbons are man-made industrial chemicals used in air conditioning etc. To write its name we must know the nomenclature rules of refrigerants.

Step by step answer: Mixed chlorofluorocarbons (sometimes called \[CFCs{\text{ }}){\text{ }}such{\text{ }}as{\text{ }}CFC{l_2},{\text{ }}C{F_2}C{l_2}{\text{ }} and {\text{ }}C{F_3}Cl\] are known as Freons. They are unreactive and non-toxic and are widely used as refrigeration fluids, as the propellant in aerosols, and for washing computer boards. Freons are very much more effective ‘greenhouse gases’ in the atmosphere than is $C{O_2}$ , though the amount of freons present is extremely small. Much more seriously, the freons have penetrated the upper atmosphere, and are causing damage to the ozone layer.
 The ozone layer is important as it filters the radiation from the sun and prevents most of the harmful UV radiation from reaching the earth.Excessive exposure to the UV radiation should be avoided as it causes skin cancer in humans.
Since in the question we are asked about the molecular formula for freons or CFCs gas one should be aware that Freon gas has formula ${C_2}{F_2}C{l_4}$ .
Chlorofluorocarbons are believed to be one of the reasons for depletion of the ozone layer. These compounds are non reactive, non flammable, non toxic organic molecules and therefore used in refrigerators, air conditioners, in the production of plastic foam and by the electronic industry for cleaning computer parts etc. once CFCs are released in the atmosphere. They mix with the normal atmospheric gases and eventually reach the stratosphere where they get broken down by powerful UV radiations, releasing chlorine free radicals. The chlorine radical then reacts with ozone to form chlorine monoxide radicals and molecular oxygen which produces more chlorine radicals. Such radicals are continuously regenerated and cause the breakdown of ozone.

Hence the correct option is A.

Note: Several less harmful aerosol propellants are now in use. Hydrofluorocarbons and Hydrochlorofluorocarbons are being used as substitutes. They are also greenhouse gases, and may damage the ozone layer, but they do less damage than CFCs because they do not remain in the atmosphere for so long.