Which one of the following carbon compounds will not give a sooty flame ?
Benzene
Hexane
Naphthalene
Anthracene
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Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2016
Sooty flames are a result of incomplete combustion, where there is insufficient oxygen to fully oxidize the fuel. This often occurs with hydrocarbons that have a relatively high carbon content compared to hydrogen. Aromatic hydrocarbons (like Benzene, Naphthalene, Anthracene) and unsaturated aliphatic hydrocarbons have a higher carbon-to-hydrogen ratio and tend to burn with sooty flames due to incomplete combustion and the formation of carbon particles (soot). Saturated aliphatic hydrocarbons (alkanes like Hexane, C6H14) have a lower carbon-to-hydrogen ratio and typically undergo more complete combustion, burning with a clean, blue flame, assuming sufficient oxygen is available.