C 4 H 8 belongs to the homologous series of

June 1, 2025 by rawan239

C₄H₈ belongs to the homologous series of

[amp_mcq option1=”alkanes” option2=”alkenes” option3=”alkynes” option4=”cycloalkanes” correct=”option2″]

This question was previously asked in

UPSC NDA-2 – 2022

Download PDF Attempt Online

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 C_nH_2n+2, for alkenes is C_nH_2n (with one double bond), and for alkynes is C_nH_2n-2 (with one triple bond). For n=4, C₄H₈ fits the general formula C_nH_2n, which corresponds to alkenes. While cycloalkanes also have the formula C_nH_2n, 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 C_nH_2n in the context of typical classification alongside alkanes and alkynes.

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