Question

(a) What is homologous series?
(b) What is the difference in molecular formula of any two adjacent homologues in terms of types of atoms and molecular mass?

Answer 1

(a) A homologous series is a group of organic compounds possessing similar structural and chemical properties. The successive members in this group differ by CH_​2.

(b)Two successive members of a homologous series differ by CH_​2, that is, by one carbon atom and two hydrogen atoms. The difference between the molecular masses of any two adjacent homologous members is 14 (i.e., CH₂ = 12 + 2$\times$1).