Question

Which of the following set of compounds does not belong to same homologous series?

Options

• CH₄ and C₄H₁₀

• C₂H₆ and C₃H₈

• C₃H₈ and C₅H₁₂

• C₄H₈ and C₅H₁₂

Answer 1

C₄H₈ and C₅H₁₂

Explanation:

Compounds in the same homologous series have the same general formula and differ by a –CH₂ group.
C₄H₈ follows the formula C_nH_2n (alkenes), while C₅H₁₂ follows C_nH_2n+2 (alkanes).
Since they belong to different functional groups, they are not in the same homologous series.