Give one use of freon.

Explanation

Uses of Freon-12. Freon-12 is chemically `C Cl_2 F_2` . Now, it is used mostly for air conditioning and refrigeration purposes. At one time it, was widely used as aerosol propellant. Due to its damaging effect on ozone in stratosphere, its use is being disscourged. Uses of DDT. Its common name is p. p-dichlorodiplcnyltrichloroethane. It was at one time widely used as an insecticide. Its use as an insecticide is being strongly disscourged due to following reasons. (a) Due to its chemical stability and fat solubility, species of insects developed resistance to DDT. (b) In animals, it is not rapidly metabolised, instead it is deposited and stored in the fatty tissues leading to many serious problems. Uses of carbon tetrachloride (`C CI_4`) (i) it is used for the manufacture of refrigerants and propellants for a aerosol cans. (ii) it was at one time used as a cleaning fluid both in industry as a degreasing agent and in the home, as a spot remover. (ii). it is also used as fire extinguisher. However due to its damaging effect on animals and human beings, its use is being strongly discouraged. Further it also damage the environment including the ozone layer. Uses of lodoform (`CHI_3`). It was at one time widely used as an antiseptic. Due to its objectionable smell it has now been replaced by other much cheaper antiseptics. It is also used in black and white photography as a photosensitizer.in the emulsion of AgBr used for making pliotographic film,