Which of the following forms a homologous series ?

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Ethane, ethylene, acetylene

Ethane, propane, butanone

Methanal, ethanol, propanoic acid

Butane, 2-methylbutane, 2,3-dimethylbutane

answer is D.

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Detailed Solution

Condition for homologous series:→ All the members of homologous series belongs to same class of compounds.→ Represented with same general molecular formula.eg.,Alkanes : CnH2n+2 (GMF)→ Adjacent members differed by 14 mass unit (or) "CH2" group.1) Ethane Ethene acetylene ↓ ↓ ↓ CnH2n+2 CnH2n CnH2n-2 ↓ ↓ ↓ Alkane alkene alkyneThe above compounds not belongs to homologous series2)The above compounds not belongs to homologous series3)The above compounds not belongs to homologous series4)The above compounds are said to be homologous series

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