Question

What is the name of the seventh member in the homologous series of the alkene group?

• A. Heptene
• B. Octene
• C. Nonene
• D. Hexene

Answer 1

The correct option is B

Octene

The first member in the homologous series of the alkene group is ethene, whose chemical formula is $C_2{H}_4$. There cannot be a carbon compound named methene as it is not possible for a single carbon atom to be joined with itself by a double bond. Since the first member of the alkene homologous series has two carbon atoms. Therefore, the seventh member will have eight carbon atoms. So, the name of the eighth member in the alkene homologous series is Octene whose chemical formula is $C_8{H}_{1}6$.