What is "homologous series"

n. (context chemistry English) any series of aliphatic organic compounds whose members differ only in the addition of a CH₂ group; for example, the carboxylic acids, CH₃(CH₂)_nCOOH where n is any non-negative number

In chemistry, a homologous series is a series of compounds with the same general formula, usually varying by a single parameter—such as the length of a carbon chain. Examples of such series are the straight-chained alkanes (paraffins), and some of their derivatives (such as the primary alcohols, aldehydes, and (mono) carboxylic acids). The single-ring unbranched cycloalkanes form another such series.

Compounds within a homologous series typically have a fixed set of functional groups that gives them similar chemical and physical properties. (For example, the series of primary straight-chained alcohols has an hydroxyl at the end of the carbon chain.) These properties typically change gradually along the series, and the changes can often be explained by mere differences in molecular size and mass. The name "homologous series" is also often used for any collection of compounds that have similar structures or include the same functional group, such as the general alkanes (straight and branched), the alkenes (olefins), the carbohydrates, etc. However, if the members cannot be arranged in a linear order by a single parameter, the collection may be better called a "chemical family" or "class of homologous compounds" than a "series".

The concept of homologous series was proposed in 1843 by the French chemist Charles Gerhardt.