Answer :
A spark is required to burn a hydrocarbon. The spark is the energy required to break the hydrocarbon molecule's carbon-carbon and carbon-hydrogen bonds, as well as the oxygen molecule's oxygen-oxygen link.
The essential energy-storing molecules in all significant forms of fossil fuels (such as coal, oil, and natural gas) and biofuels are hydrocarbons. They serve as the raw material for making many different kinds of polymers.
When hydrocarbons are burned with oxygen (O2), carbon dioxide (CO2) and water are produced (H2O). Carbon monoxide (CO) may also be released during the burning of hydrocarbons if there is an imbalance between the amount of carbon and oxygen present. Occasionally, incomplete combustion results in the release of unburned hydrocarbons into the atmosphere.
Some hydrocarbons are released into the atmosphere when fossil fuels, such as gasoline, are burned in automotive engines. The air concentration of hydrocarbons in a typical metropolitan area is roughly 3 ppm (parts per million). Some hydrocarbons, along with other forms of Volatile Organic Compounds (VOCs), contribute to photochemical smog generation.
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