Which of the following statements is true about the physical properties of compounds in a homologous series?

A homologous series is a family of organic compounds in which successive members differ by a -CH2- unit, so each step adds the same increment of molecular mass. As the chain length grows, van der Waals (dispersion) forces between molecules become stronger, causing a steady rise in both melting and boiling points. Because this increase follows a predictable pattern, chemists describe it as a 'regular' or 'gradual' change rather than identical or decreasing.