The general molecular formula of alkanes is CnH2n+2, where n is the number of carbon atoms present.
When n=1, the compound is CH4.
When n=2, the compound is C2H6.
When n=3, the compound is C3H8 and so on.
Therefore the alkanes from the given set of hydrocarbons are CH4, C2H6, C3H8.
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