A chemical reaction in which a hydrocarbon reacts with oxygen atom and results in the formation of carbon dioxide and water is known as combustion reaction.
For example,
Here, propane is the hydrocarbon which is reacting with oxygen atom and yields carbon dioxide and water.
Therefore, we can conclude that the given chemical reaction is a combustion reaction.
The most abundant of all of the isotopes of an element will be the one who's mass the mass of element is closest to. In this case, the mass of atomic carbon is closest to the mass of carbon-12. Thus, Carbon-12 is the most abundant isotope.
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