Which of the following carbon compounds is most likely to burn with a non-luminous flame?
Ethanol
A flame appears luminous only when unburnt carbon particles glow within it; complete combustion removes these particles and yields a clean, non-luminous flame.
Ethanol, \(C_{2}H_{5}OH\), already carries oxygen inside the molecule, so it undergoes almost complete combustion and burns with a pale, non-luminous blue flame.
Charcoal is mostly elemental carbon, and camphor and kerosene are hydrocarbons rich in carbon; all three release incompletely burnt carbon that glows, producing a bright yellow luminous flame with soot.
Hence, the compound most likely to burn with a non-luminous flame is ethanol.
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