Homologous series is a series of compounds with similar chemical properties and some functional group differing from the successive member by CH 2. The members of the homologous series consists of same general formula such as Alkanes have general formula C n H 2n+2 2. Why are certain compounds called hydrocarbons ? (ii) They have the same functional group. are all part of the alkane homologous series. The two adjacent homologues have a difference of molecular mass of 14 u. The general formula of this series is CnH2n+2. The members of a homologous series can be represented by same general formula. Characteristics of a homologous series. General characteristics of members of homologous series - definition ... Homologous series is the characteristic feature of carbon compounds in which carbon and hydrogen atoms in hydrocarbons varying by single parameter. The members of a series have same functional group. The compounds of the homologous series have some characteristics – they are as follows: General formula: All the members of a series can be represented by the same general formula. -CHO group. Name the type of bonding found in most of its compounds. Homologous series have the following common characteristics. 1. Designed by the teachers at SAVE MY EXAMS for the CIE IGCSE Chemistry 0620 / 0971 syllabus. The general characteristics of a homologous series are: (i) All compounds in the series are composed of the same elements and contain the same functional group. 3. Successive members differ from each other by C H 2 .Physical properties change regularly with increasing number of carbon atoms. State compounds that determines their physical and chemical properties? STRUCTURAL FORMULA All the members of a homologous series have same structural formula. Two consecutive members of a homologous series differs each other in their composition by –CH 2 unit. Give the general name of the class of compounds having the general formula CnH2n-2 Write name the first member of this homologous series. -OH group. The general formula of this series is CnH2n+2. Define homologous series of organic compounds list its two characteristics. (i) All the members of a homologous series can be represented by the same-general formula. List two reasons for carbon forming a large number of compounds. The members of the homologous series consists of same general formula such as Alkanes have general formula CnH2n+2, 2. The two characteristics of homologous series are as follows: 1. MOLECULAR FORMULA Molecular formula of different members of a homologous series … Why homologous series of carbon compounds are so called? Write the general formula of. All the members of a homologous series have a similar structural formula. 1) Each homologous series can be represented by a general formula. Homologous series is a series of compounds with similar chemical properties and some functional group differing from the successive member by CH 2. Difference in molecular mass of two consecutive members of the series is 14 unit i.e. Carbon chains of varying length have been observed in organic compounds having the same general formula. General characteristics of members of homologous series - definition Members of the series can be represented by a general formula. 2. Write the name and formula of the first member of the series of alkenes. What are homologous series of carbon compounds ? Homologous series helps in determination of structure of the successive member of the series and the property of that members can also be predicted by their series. The following is one of the Chemistry SPM 2009 questions related to homologous series. What is meant by homologous series of carbon compounds ? For example, methane, ethane, propane, butane, etc. are all part of the alkane homologous series. (ii) The difference in the molecular mass of any two adjacent homologues is 14 u. Characteristics of a Homologous series . All members of a homologous series contain the same elements and functional group. The two characteristics of homologous series are as follows: 1. A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group. Why homologous series of carbon compounds are so called ? Same functional group: All members of a series contain the same functional group i. e. alcohol has -OH group and amine has –NH 2 grou p etc. 2) All the members of a given homologous series possess the same functional group. 3. Characteristics of homologous series Each member of the series differs from the preceding or succeeding member by one methylene group (–CH 2) and hence by a molecular mass of 14 amu.