Why does ethyne (acetylene) burn with sooty flame ?
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Answered by
96
Ethyne is an unsaturated hydrocarbon. This makes it to have a higher carbon ratio as compared to hydrogen in the structure. Therefore when ethyne burns, it burns with incomplete combustion leading to the sooty flame.
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The unsaturated hydrocarbons l[alkene and alkyne ] burn in air with a yellow sooty flame producing black smoke.
for example: Ethyne burns in air with a sooty flame because the percentage of carbon in unsaturated hydrocarbon is comparatively higher than alkane which does not get oxidised completely in the presence of air.
Air contains only 21% of O2 which is not sufficient for complete combustion.
But if unsaturated hydrocarbons are burnt in pure O2 than complete combustion can take place.
for example: Ethyne burns in air with a sooty flame because the percentage of carbon in unsaturated hydrocarbon is comparatively higher than alkane which does not get oxidised completely in the presence of air.
Air contains only 21% of O2 which is not sufficient for complete combustion.
But if unsaturated hydrocarbons are burnt in pure O2 than complete combustion can take place.
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