Give reason: Acetylene burns with a sooty flame.
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Acetylene burns in air with a yellow sooty flame and also produces carbon monoxide (incomplete combustion). However, if acetylene is mixed with an excess of oxygen, it burns with a very hot blue flame (as high as 3000oC).
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Ethyne (acetylene) burn with a sooty flame because ethyne is an unsaturated hydrocarbon and the percentage of carbon in these hydrocarbons is comparatively higher which does not get oxidised completely in oxygen of air.
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