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

Options

A. `CH_(4)`
B. `C_(2)H_(6)`
C. `C_(3)H_(8)`
D. `C_(4)H_(8)`

Answer

D

Explanation

Because succesive members of a homologous series differ by `-CH_(3)` unit

Thus, `C_(4)H_(10)` is the next member of this series
So, homologous series of alkanes is
Methane `CH_(4)`,
Ethane `C_(2)H_(6)`,
Propane `C_(3)H_(8)`,
Butane `C_(4)H_(10)`
So, `C_(4)H_(8)` does not belong to the homologous series.