Members of a homologous series have

Two numbers of a homologous series have

All the members of homologous series have the same ____________

C_2H_6 and C_5H_12 are members of a homologous series. What is a homologous series?

C_2H_6 and C_5H_12 are members of a homologous series. What is the general molecular formula of the above homologous series.

Which of the following pairs can be the successive members of a homologous series ?

Write the molecular formulae of the first two members of the homologous series having functional group, -COOH.