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51.	State the uses of the following compounds : (1) Dichloromethane (CH2CI2) (2) Trichloromethane or Chloroform (CHCI3) (3) Tetrachloromethane or carbon tetrachloride (CCI4) (4) Iodoform (CHI3) (5) Freons (6) DDT (p, p'-Dichlorodiphenyl trichloroethane).
Answer» (1) Dichloromethane (CH₂CI₂) : Dichloromethane dissolves wide range of organic compounds, hence it is used as solvent for many chemical reactions. It is used as a solvent as a paint remover and degreaser. It is used as propellant in aerosols and as a fumigant pesticide for grains and strawberries. It is used to decaffinate tea or coffee. (2) Trichloromethane or Chloroform (CHCI₃) : Chloroform in the production of chlorofluoromethane, freon refrigerant R-22. It is used as solvent in pharmaceuticals, pesticides, gums, fats, resins and dye industry. It is a good source of dichlorocarbene species. (3) Tetrachloromethane or carbon tetrachloride (CCI₄) : Carbon tetrachloride is used in the manufacture of refrigerants. It is used as a dry cleaning agent and as a pesticide for stored grains. It is very useful solvent for oils, fats and resins. It serves as a source of chlorine. (4) Iodoform (CHI₃) : Iodoform is used as antiseptic, dressing of wounds and sores. On small scale it is used as disinfectant. (5) Freons : Freons are widely used as propellants in aerosol, products of food, cosmetics and pharmaceutical industries. Freons containing bromine in their molecules are used as fire extinguishers. They are used in aerosol insecticides, solvent for cleaning clothes and metallic surfaces. It is used as foaming agents in the preparation of foamed plastics and in production of certain fluorocarbons. It is used as refrigerants and air conditioning purposes.

51.

State the uses of the following compounds : (1) Dichloromethane (CH2CI2) (2) Trichloromethane or Chloroform (CHCI3) (3) Tetrachloromethane or carbon tetrachloride (CCI4) (4) Iodoform (CHI3) (5) Freons (6) DDT (p, p'-Dichlorodiphenyl trichloroethane).

Answer»

(1) Dichloromethane (CH₂CI₂) :

Dichloromethane dissolves wide range of organic compounds, hence it is used as solvent for many chemical reactions.
It is used as a solvent as a paint remover and degreaser.
It is used as propellant in aerosols and as a fumigant pesticide for grains and strawberries.
It is used to decaffinate tea or coffee.

(2) Trichloromethane or Chloroform (CHCI₃) :

Chloroform in the production of chlorofluoromethane, freon refrigerant R-22.
It is used as solvent in pharmaceuticals, pesticides, gums, fats, resins and dye industry.
It is a good source of dichlorocarbene species.

(3) Tetrachloromethane or carbon tetrachloride (CCI₄) :

Carbon tetrachloride is used in the manufacture of refrigerants.
It is used as a dry cleaning agent and as a pesticide for stored grains.
It is very useful solvent for oils, fats and resins. It serves as a source of chlorine.

(4) Iodoform (CHI₃) :

Iodoform is used as antiseptic, dressing of wounds and sores.
On small scale it is used as disinfectant.

(5) Freons :

Freons are widely used as propellants in aerosol, products of food, cosmetics and pharmaceutical industries.
Freons containing bromine in their molecules are used as fire extinguishers.
They are used in aerosol insecticides, solvent for cleaning clothes and metallic surfaces.
It is used as foaming agents in the preparation of foamed plastics and in production of certain fluorocarbons.
It is used as refrigerants and air conditioning purposes.

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