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Saturated hydrocarbons are those which have single bond in there mutual sharing for example ; -H-C-H( BY THE CARBONS TETRAVALENCY THERE ARE 4 hydrogen atom )
unsaturated hydrocarbons are those who has thee double and triple bond with the carbon
N3,  etc NH3
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when hydrogen combine with unsturated hydrocarbon then it changes into saturated and this reactn is called hodrogenation or addition reactn it is used to change ghee to oil