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Q6.13:
Give the uses of freon 12, DDT, carbon tetrachloride and iodoform.

Solution :

1. Freon-12 (Dichlorodifluoromethane, $CF_2Cl_2$)

Freon-12 is a chlorofluorocarbon (CFC) derivative primarily utilized for its thermal stability and inertness in specific applications [Per industrial chemical standards for refrigerants].

  • Refrigeration and Air Conditioning: It was historically the most common refrigerant used in domestic refrigerators and automobile air conditioning systems due to its low toxicity and favorable boiling point.
  • Aerosol Propellants: It served as a propellant for aerosol sprays (e.g., hairsprays and deodorants) [Chemical property: High vapor pressure].
  • Note: Its usage has been severely restricted globally under the Montreal Protocol because it causes significant depletion of the stratospheric ozone layer upon photochemical decomposition.

2. DDT (1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane)

DDT is an organochlorine compound synthesized as a potent insecticide [Chemical class: Polyhalogenated aromatic compound].

  • Insecticide/Pesticide: It was used extensively during and after World War II to combat malaria and typhus by killing mosquitoes and lice.
  • Agricultural Application: Used to control pests on various crops, such as cotton, to prevent yield losses.
  • Note: Its use is now largely banned or restricted in many countries due to its high chemical stability, lipophilic nature (bioaccumulation in fatty tissues), and subsequent toxicity to non-target organisms.

3. Carbon Tetrachloride ($CCl_4$)

Carbon tetrachloride is a non-polar, volatile solvent used heavily in industrial applications throughout the 20th century [Chemical property: Solvent power for organic oils and fats].

  • Dry Cleaning Solvent: It was the primary cleaning fluid used in the dry cleaning industry to remove stains and grease from textiles.
  • Industrial Solvent: Used as a solvent for oils, fats, resins, and lacquers in industrial manufacturing.
  • Fire Extinguishing: Historically employed in specialized fire extinguishers, particularly for electrical fires, due to its non-conductive nature and density [Physical property: High density].
  • Chemical Synthesis: Serves as a precursor for the manufacture of chlorofluorocarbons and other chlorinated organic compounds.

4. Iodoform (Triiodomethane, $CHI_3$)

Iodoform is a yellow, crystalline solid characterized by its distinct odor and antiseptic properties [Chemical property: Liberates free iodine upon contact with skin].

  • Antiseptic: Used in medical and veterinary medicine as an antiseptic for dressing wounds and treating surface infections.
  • Mechanism: Its antiseptic action is not due to the molecule itself, but to the slow liberation of free iodine upon contact with skin or tissue [Chemical reaction: $2CHI_3 \rightarrow 2CHI_2 + I_2$].

Summary Table of Applications

Compound Primary Use
Freon-12 Refrigerant and aerosol propellant.
DDT Potent insecticide for vector and crop control.
Carbon Tetrachloride Dry cleaning agent and industrial solvent.
Iodoform Antiseptic in medical dressing.

Final Solution: The uses are categorized by the functional profile of each halogenated compound: Freon-12 (refrigerant), DDT (insecticide), Carbon Tetrachloride (solvent/fire extinguisher), and Iodoform (antiseptic).


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