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Why do unsaturated carbon compounds produce sooty flame while saturated carbon compounds produce  clean flame?

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Devanshi and Raghuraman have posted correct answers.

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 unsatuarated carbon compounds produce sooty flame because it has free carbon atoms that reacts with oxygen to produce Co2

gas & satuarated compounds produce a clean flame as it has no free atoms

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 because unsat HC have free carbon atoms and during combustion reaction carbon mix with oxygen in air to form CO2 which is the sooty deposit

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In saturated hydrocarbons (alkanes), the percentage of carbon is lower which gets easily oxidised in oxygen of the air to form CO2 and water whereas in unsaturated hydrocarbons (alkenes and alkynes) the percentage of carbon in one molecule is higher which does not gets completely oxidised by the amount of oxygen present in air and thus incomplete combustion of carbon occurs and the unburnt carbon particles produce a lot of smoke and soot...The air has only 21 percent of oxygen which is insufficient for the combustion of alkenes and alkynes...

If, however, these alkenes and alkynes are provided with more and more oxygen,then they will also get completely oxidised in CO2 and water and thus burn with a non-sooty and blue flame...

hope this helps... :)

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