C4H8 belongs to the homologous series of
alkanes
alkenes
alkynes
cycloalkanes
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UPSC NDA-2 – 2022
Homologous series are a series of compounds with the same general formula, usually differing by a single methylene (CH₂) unit. The general formula for alkanes is CnH2n+2, for alkenes is CnH2n (with one double bond), and for alkynes is CnH2n-2 (with one triple bond). For n=4, C₄H₈ fits the general formula CnH2n, which corresponds to alkenes. While cycloalkanes also have the formula CnH2n, alkenes are the primary open-chain homologous series with this formula.