Answer:
Uses of Freon 
(i) It is used as a refrigerant.
(ii) It is used as propellants
in aerosols and foams.
(iii) It is also used for air
conditioning purposes.
Uses of DDT [p p?-dichlorodiphenyltrichloroethane]
(i) It is an effective insecticide
against the mosquito that spreadsmalaria and lice that carry typhus.
(ii) It is also used in many
countries as insecticide for sugarcane andfodder crops.
[Due to its non-biodegradable nature,
its use has been banned invarious countries including U.S.A.]
Use of carbon tetrachloride 
(i) It is used in the manufacture of
refrigerants.
(ii) It is used in the
manufacture of propellants of aerosol cans.
(iii) It is also used as
feedstock in synthesis of chlorofluoro carbons andother chemicals.
(iv) It is used as a
fire-extinguisher under the name pyrene due to itsnon-inflammable nature.
(v) It is used as a cleansing
agent in home and industries.
(vi) It is also used as an important
solvent.
Uses of iodoform [Triodomethane
]
(i) It is used as an antiseptic,
particularly for dressing wounds.
Note Use of freons is not
environment friendly, as it damages the ozonelayer in the atmosphere.
Due to unpleasant odour of iodoform, its
use as an antiseptic is replaced byother iodine containing compounds.
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