C 4 H 8 belongs to the homologous series of

by

C4H8 belongs to the homologous series of

alkanes
alkenes
alkynes
cycloalkanes
This question was previously asked in
UPSC NDA-2 – 2022
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The correct answer is alkenes.
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.
C₄H₈ can represent various isomers, including but-1-ene, but-2-ene, 2-methylpropene (isobutylene), and cyclobutane or methylcyclopropane. Among the given options for homologous series, alkenes are the direct fit for the formula CnH2n in the context of typical classification alongside alkanes and alkynes.

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