Question

Aromatic compounds burn with sooty flame because

• A. They have a relatively high percentage of hydrogen
• B. They have a relatively high percentage of carbon
• C. They have a ring structure
• D. They are reluctant to react with atmospheric oxygen.

Answer 1

The correct option is B

They have a relatively high percentage of carbon

The explanation for the correct option:

B. They have a relatively high percentage of carbon

Aromatic compound:

• The aromatic organic molecules that are made up of carbon and hydrogen atoms are known as aromatic hydrocarbons.
• Aromatic hydrocarbons are also referred to as Arenes.
• Aromatic compounds are cyclic/ring structures such as Benzene$\left({\mathrm{C}}_6{\mathrm{H}}_6\right)$.

Properties of Aromatic compound:

• The aromatic compound displays aromaticity.
• They burn with a strong sooty yellow flame.
• A "sooty flame" indicates that incomplete combustion is occurring and the reason for this flame is the high percentage of carbon content.
• The carbon-hydrogen ratio is high in aromatic compounds.

The explanation for incorrect options:

The properties of aromatic compounds such as they have a relatively high percentage of hydrogen, having a ring structure, and being reluctant to react with atmospheric oxygen, are not responsible for the sooty flame in aromatic compounds. Thus options A, C, and D are incorrect.

Hence, the correct option is B i.e.they have a relatively high percentage of carbon.