Used as a feed stock in the preparation of chlorofluoro carbons. The effect of CCI4 early are dizziness, light headache, nausea, vomiting, permanent damage to nerve cells. And if it is severe it causes stupor, coma, unconsciousness or death. Exposure may irritate eyes, heart beat becomes irregular or may even stop. If released into air depletes ozone layers.Used In the production of freon refrigerant R-22 Inhaling the vapours depress central nervous system. Breathing 900 parts of chloroform per million parts of air for a short time causes dizziness, fatigue and headache. Previously this is used as an anesthetic but not now because of the formation of a poisonous gas phosgene carbonyl chloride.

C Tri iodo methane Iodoform : Previously this is used as an antiseptic. But this nature is not due to iodoform but due to liberation of iodine. Due to its smell this has been replaced by other compounds containing iodine.

D Tetra chloro methane carbon tetrachloride : Used as a solvent Used in the manufacture of refrigerants and propellents for aerosol cans.Dichloro methane Methylene chloride Widely used as a solvent, as a paint removes, as a solvent in the manufacture of drugs, as a propellent in aerosols. Used as a solvent in metal furnishing and cleaning. This effects the human central nervous system and when exposed it causes slight impaired hearing and vision. Higher level of methylene chloride causes dizziness, nausea, tingling and numbness in fingers and toes. Direct contact with eyes can burn the cornea. Direct contact with skin causes intense burning and mild redness of the skin. Trichloromethane chloroform Used as a solvent for fats, alkaloids, iodine etc.

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