Question

saturated hydrocarbons burn with a clean blue flame while unsaturated was burn with a sooty flame why

Answer 1

why do saturated hydrocarbons burnwith blue flame and unsaturated burnwith a suthe flame? Ans: It depends on Carbon to hydrogen ratio. The molecules which contains alomsot equal number of Carbon and hydrogens will burns with sooty flame
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Answer 2

this happens because of incomplete combustion of the saturated hydrocarbon in air the frame is suitable cause the percentage of carbon is comparatively higher than that of the alkanes and so does not get properly oxidized in our however when acetylene and pure oxygen burn a non sooty blue flame is produced.
saturated hydrocarbon give blue frame when complete combustion
unsaturated hydrocarbon give yellow Flame of sooty flame while incomplete combustion Occur