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SOURCES OF ORGANIC COMPOUNDS.

All organic compounds aat one time came from plants or animals.many of our  most importants substance  are still derived from these sources directly or indirectly.

1) PLANTS AND ANIMALS

     Many organic compounds are obtained directly from plant and animals sources by suitable. method of isllation.a few familiar EXAMPLE are carbohydrates (cellulose, sugar, and starches.) proteins (silk, wool, casein, and food proteins) fats and oils(cottonsed soybean oils lard, butter) alkaloids (quinine ,morphine, strychnine) hormones, vitamins,perfumes, flavours and resins.

2) NATURAL GAS AND PETROLEUM.

             Natural gas and petroleum are now the major sourcse of organic compounds .they are used as fuels  and also, throughsynthetic organic reaction.for the production of hundreds of useful organic substances such as solvents,synthetic rubber,explosive,and plastic.

3)  COAL

           Coal is another major sources of organic compounds.it yield coke and coal-tar on pyrolysis or destructive distillation.more then 200                    organic compounds have been directly isolated from coal-tar. these coal-tar products from the starting materialsfor the manufacture of thousands of useful aromatic compounds,including pefumes,drugs,dyes, photographic developers,and other.

4)  SYNTHESIS.

      Simple organic compunds derived from petroleum or coal have been converted into thousands of useful materials by synthetic mthod.many EXAMPLE might be cited of syntgetic organic compounds replacing those obtained from natural sources,such as dyes, rubber, fibres, plastic ,drugs, vitamins.in many  cases the synthetic materials are superior to the natural compounds replaced.for example ,synthetic dyes are superior to those of natural origin.in other cases the synthetic materials are entirely unknown in nature and fill the requirements not satisfied are entirely other sources.EXAMPLE.are ether .glycol, aspirin, and sulpher drugs.synthetic organicchemistry touches almost every phase of life.

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