Question

which type of hydrocarbon give sooty flame after burning​

Answer 1

Explanation:

Ethyne also known as Acetylene burns with a sooty flame since incomplete combustion of carbon atoms and do not get completely oxidized in air.

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Answer 2

Both ethene (C2H4) and benzene (C6H6) have unsaturation in them. But benzene is an aromatic compound having relatively more carbon content (carbon to hydrogen ratio). So it does not get completely oxidized during combustion and gives out sooty flames.