Question

Aromatic compounds burn with sooty flame because:
a.) They have a ring structure of carbon atoms
b.) They have a relatively high percentage of hydrogen
c.) They have a relatively high percentage of carbon.
d.) They resist reaction with oxygen or air.

Answer 1

Hint: Hydrocarbons are organic compounds containing only carbon and hydrogen.
Aromatic hydrocarbons: The carbocyclic compounds which contain at least one benzene rings are termed as aromatic compounds.

Complete step by step solution:
The shade of the flame of burning relies upon the carbon compound being utilized. We will get a perfect flame with immersed hydrocarbons while unsaturated carbon mixes will create a yellow fire with dark smoke. At last, the consumption of carbon compounds brings about a dingy store on the surface. In the event that there is incomplete combustion of immersed hydrocarbons because of the limited supply of air, a dingy flame will be observed. A great deal of carbon remains unburnt because of the high grouping of carbon, which escapes as little particles called soot. A "sooty flame" indicates that incomplete combustion is occurring. The most probable reason for incomplete combustion is the absence of oxygen.
Therefore, the correct option is C.

Note: The possibility to make a mistake is that you may choose option B. Since, in hydrocarbons both carbon and hydrogen are present but when aromatic hydrocarbons burn with a sooty flame then the content of carbon is high in between 90-98 percent but the hydrogen content is not that much.