Which of the following pairs of compounds belongs to the same homologous series?

Which of the following pairs of compounds belongs to the same homologous series?

A C₃H₈ and C₃H₆
B C₄H₁₀ and C₅H₁₀
C C₂H₄ and C₄H₁₀
D C₂H₆ and C₄H₁₀

waec 2015 chemistry

The correct answer is D. C₂H₆ and C₄H₁₀

both ethane and butane are in the same homologous series.( alkanes)

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