Homologous series 1. Methane, ethane, propane, butane and so on is a homologous series. A homologous series is a family of organic compounds with the same functional group and similar chemical properties. Members of the same homologous series can be prepared through one common method. Figure 02: Boiling Points Gradually Change in a Homologous Series Typically, the members of a homologous series contain a fixed set of functional groups that give these molecules similar chemical and physical properties. Homologous Series A series of compounds with similar chemical properties, in which members differ from one another by the possession of an additional CH2 group, is called a homologous series.Each homologous series must have the following four characteristics:Every member in the homologous series can be represented by a common formula. A homologous series is a series of compounds, which has the same functional group. -I'll take it that you're touching on the topic of organic chemistry, and hence, at least have a general idea of what are alkanes, alkenes, alcohols, and carboxylic acids. Some important series of aliphatic compounds are listed below: If we examine the unbranched alkanes, we notice that each alkane differs from the preceding alkane by one —CH 2 — group. Homologous Series 2. Examples:- Since there is a change in the physical properties, we can say that there would be an increase in the molecular size and mass. For example, methane and ethane are homologues and belong to the same homologous series. For example:Alkane: CnH2n+2Alkene: CnH2nAlcohol: … A series of compounds with similar chemical properties, in which members differ from one another by additional CH2 group, is called a homologous series. There are a number of homologous series in organic compounds. Similarly the series of alkene and alkynes also forms homologous series. They differ from each other by one CH 2 group. For example, a homologous series of straight-chain alkanes begin with methane, ethane propane, butane and pentane. Examples of homologous series are alkanes, alkenes, alcohols and carboxylic acids. For example, the series of alkanes i.e. This also contains similar general formula and chemical properties.

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