Question

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

Options

• CH₄

• C₂ H₆

• C₃ H₈

• C₄ H₈

Answer 1

C₄ H₈

Explanation - 

The succeeding members of the homologues series differ by a —CH₂ - unit. The general formula for the alkane is C_nH_2n+2. Methane (CH₄), ethane (C₂H₆) and propane (C₃H₈) are members of homologues series for alkanes while butene (C₄H₈) is the fourth member of homologues series for alkene.