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Assertion (A): C4H8, C4H6 and C4H10 are members of the same homologous series Reason (R): C4H8, C4H6, C3H4, C3H6, C2H4, C2H2 are unsaturated hydrocarbons.
Correct option – D. Assertion A is false — C4H10 is saturated (alkane) while C4H8 (alkene) and C4H6 (alkyne/diene) are unsaturated. Reason R is true because the listed compounds (except C4H10) are unsaturated, so choose option D.
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The assertion is incorrect because members of a homologous series differ by a fixed CH₂ unit and have similar functional groups and general formula. C₄H₁₀ is an alkane (saturated) with formula CnH2n+2, whereas C₄H₈ is an alkene and C₄H₆ an alkyne/diene — both unsaturated and belonging to different homologous series. The reason statement R is true: the listed compounds (C₄H₈, C₄H₆, C₃H₄, C₃H₆, C₂H₄, C₂H₂) are examples of unsaturated hydrocarbons. Therefore, option D is the correct choice here.