Multiple choice

The first three members of a homologous series are CH4, C2H6 and C3H8. What is the fifth member of this series?

  1. C5H10

  2. C5H8

  3. C5H6

  4. C5H12

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D Correct answer
Explanation

The given compounds CH4, C2H6, and C3H8 are alkanes following the general formula CnH2n+2. The homologous series continues with C4H10 (butane) and C5H12 (pentane). Therefore, the fifth member is C5H12.