What do methane, ethane and propane represent in the study of carbon compounds?
Chains containing increasing carbon atoms
Methane (CH4), ethane (C2H6) and propane (C3H8) are the first members of the alkane homologous series (CnH2n+2).
They contain 1, 2 and 3 carbon atoms respectively, so each successive member has one more carbon atom (a –CH2– unit) in the chain than the previous one.
They are saturated open-chain hydrocarbons, not aromatic compounds, and contain no metal atoms; only methane has a single carbon atom.
Hence, the answer is Chains containing increasing carbon atoms.
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