Why do unsaturated hydrocarbons show incomplete conbustion?
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Unsaturated hydrocarbons contain greater percentage of carbon than alkanes. As a result, not all the carbon gets oxidised, which makes the unsaturated hydrocarbon give a sooty flame, or show incomplete combustion.
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Unsaturated hydrocarbons like ethyne, also known as acetylene, burn to produce a yellow, sooty flame due to incomplete combustion in air.
The flame is sooty because the percentage of carbon is comparatively higher than that of alkanes and so does not get completely oxidized in air.
However, when acetylene and pure oxygen burn, a non-sooty, blue flame is produced.
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