Homologous Series — Prelims Questions

Which of the following statements is NOT a characteristic of a homologous series?

What is the general formula for the homologous series of carboxylic acids (monocarboxylic, acyclic)?

The difference in molecular mass between two successive members of a homologous series is:

Which of the following pairs represents members of the same homologous series?

Which of the following compounds has a higher boiling point than ethanol ($\text{CH}_3\text{CH}_2\text{OH}$)?

If the general formula for a homologous series is $\text{C}_n\text{H}_{2n-2}$, which of the following compounds belongs to this series?