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Burning of a saturated hydrocarbon will result in which type of flame?
Clean flame
Sooty flame
Yellow flame
Green flame
Clean flame
Saturated hydrocarbons, such as alkanes, undergo complete combustion in the presence of sufficient oxygen, leading to a clean, blue flame. Because they have a higher proportion of hydrogen relative to carbon, they burn completely without producing unburnt carbon particles.
Saturated hydrocarbons, such as alkanes, undergo complete combustion in the presence of sufficient oxygen, leading to a clean, blue flame. Because they have a higher proportion of hydrogen relative to carbon, they burn completely without producing unburnt carbon particles.
Think of a gas stove in your kitchen; when the air vents are clear, the flame burns blue and clean, which is typical for saturated hydrocarbons like LPG (propane/butane).
SAT = Saturated, Air-rich, Transparent-flame (Clean).
CnтАЛH2n+2тАЛ+23n+1тАЛO2тАЛтЖТnCO2тАЛ+(n+1)H2тАЛO
╬ФH<0 тАФ Represents the exothermic nature of combustion.
The chemical reaction involves the rapid oxidation of hydrocarbons. For a saturated hydrocarbon like methane, the reaction is CH4тАЛ+2O2тАЛтЖТCO2тАЛ+2H2тАЛO+Heat. Because the oxygen is sufficient to oxidize all carbon atoms into CO2тАЛ, no free carbon is released, resulting in a non-luminous, clean flame.
Saturated hydrocarbons contain only single CтИТC bonds.
Complete combustion yields only carbon dioxide and water vapor.
The absence of soot is due to the complete oxidation of the carbon backbone.
High efficiency of energy conversion
Less environmental pollution due to absence of particulates
Releases greenhouse gas CO2тАЛ
Domestic LPG cooking gas
Laboratory Bunsen burners when air-holes are open
| Feature | Saturated Hydrocarbons | Unsaturated/Rich Fuel |
|---|---|---|
Combustion Type | Complete Combustion | Incomplete Combustion |
Unsaturated hydrocarbons or limited oxygen supply lead to incomplete combustion, producing C (soot), CO, and a yellow flame.
Option B (Sooty flame) occurs for unsaturated hydrocarbons or in oxygen-deficient conditions.
A is correct тАФ Saturated hydrocarbons burn with a clean blue flame due to complete combustion in the presence of sufficient oxygen.
Remember that the sootiness of a flame is directly proportional to the carbon-to-hydrogen ratio and inversely proportional to the availability of oxygen.