What is typically true about members of a homologous series?

Members of a homologous series exhibit similar chemical properties primarily due to their structural similarities. A homologous series consists of compounds that share the same functional group and differ by a constant unit, typically a -CH₂- group. This similarity in structure leads to comparable chemical behavior; for instance, as you move from one compound to the next in the series, they tend to undergo similar reactions.

For example, the alkanes (a type of homologous series) all have the general formula CnH2n+2 and react with substances like halogens in a similar way, exhibiting characteristic reactions. This trend in chemical behavior is consistent across the series due to the presence of the same functional group, which dictates how the compounds interact with other substances.

The other options do not accurately reflect the nature of a homologous series. Members do have a general formula which is consistent across the series (contrary to the first option). They indeed share common characteristics, particularly related to their chemical behavior and functional groups, which makes them similar in reactivity (opposing the third option). Lastly, they can be represented by a general formula as mentioned, which contradicts the fourth option. Thus, the accurate assertion that members of a homologous series exhibit similar