Question

Which amongst the following is the next homologue of ethene? Explain.
(i) Propene
(ii) Propane
(iii) Ethyne
(iv) Ethane
[2 Marks]

Answer 1

The compounds that have the same functional group and can be represented by a same general formula, form a homologous series. In a homologous series, the successive members differ by a -$C{H}_2$ group.

So, the next homologue of ethene $\left(C_2{H}_4\right)$ which has a general formula of ${\text{C}}_n{\text{H}}_{\text{2n}}$ is propene $\left({\text{C}}_3{\text{H}}_6\right)$.
[2 Marks]