AROMATIC COMPOUNDS BURN WITH SOOTY FLAME BECAUSD1.THEY HAVE HIGH PERCENTAGE OF HYDROGEN2.THEY HAVE A RINGG STRUCTURE3.THEY HAVE HIGH PERCENTAGE OF CARBON4.THEY RESIST REACTION WITH AIR

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Aromatic compounds burn with sooty flame Due to the more carbon content w.r.t hydrogen of aromatic compounds.

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Because of the high carbon-hydrogen ratio. A flame is "sootier" when there is less oxygen present in it. In an alkane you have more hydrogen to burn than carbon and 2 hydrogen atoms only require one oxygen to burn. Since CO2 is produced when burning organic compounds one C requires 2 oxygen atoms in order to burn. So when you have more carbons per hydrogens burning, you get a larger consumption of oxygen per area. Less oxygen means sootier flame.