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. 2) All the members of a given homologous series possess the same functional group. are all part of the alkane homologous series. Characteristics of a homologous series. Methane CH4 Two consecutive members of a homologous series differs each other in their composition by –CH 2 unit. Homologous series is a series of compounds with similar chemical properties and some functional group differing from the successive member by CH 2. (i) All the members of a homologous series can be represented by the same-general formula. All the members of a homologous series have a similar structural formula. The functional group of aldehyde is aldehydic group i.e. This gives the homologous series name. 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. Why homologous series of carbon compounds are so called? Why homologous series of carbon compounds are so called ? (ii) The difference in the molecular mass of any two adjacent homologues is 14 u. General characteristics of members of homologous series - definition Members of the series can be represented by a general formula. The two adjacent homologues have a difference of molecular mass of 14 u. The table shows some information about three members of a homologous series. Characteristics of Homologous Series In Chemistry SPM, students were introduced with five homologous series: Alkane, Alkene, Alcohol, Carboxylic Acids and Esters. Write the general formula for homologous series of alkanes, alkenes, and alkynes and also draw the structure of the first member of each series. What is meant by homologous series of carbon compounds ? FREE Chemistry revision notes on Homologous Series. 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. The members of a homologous series can be represented by same general formula. Carbon chains of varying length have been observed in organic compounds having the same general formula. Four characteristics of a homologous series are: (i) The general formula of all compounds in the series is the same. 1) Each homologous series can be represented by a general formula. Difference in molecular mass of two consecutive members of the series is 14 unit i.e. The two characteristics of homologous series are as follows: 1. The following is one of the Chemistry SPM 2009 questions related to homologous series. What is meant by homologous series of organic compounds ? The members of the homologous series consists of same general formula such as Alkanes have general formula C n H 2n+2 2. State compounds that determines their physical and chemical properties? The series which consists of similar structures and similar chemical properties in which the successive compounds differs by a CH2 group is termed as homologous series. Define homologous series of organic compounds list its two characteristics. 3. Characteristics of a Homologous series . What are homologous series of carbon compounds ? 2. Homologous series is a series of compounds with similar chemical properties and some functional group differing from the successive member by CH 2. List two reasons for carbon forming a large number of compounds. Give the general name of the class of compounds having the general formula CnH2n-2 Write name the first member of this homologous series. For Ex:The functional group of alcohols is the hydroxyl group i.e. 2. MOLECULAR FORMULA Molecular formula of different members of a homologous series … 2. -OH group. 1. The members of a series have same functional group. Answer:- A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group. Name the type of bonding found in most of its compounds. Carbon chains of varying length have been observed in organic compounds having the same general formula. 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. Write the name and formula of the first member of the series of alkenes. For example, methane, ethane, propane, butane, etc. For example, methane, ethane, propane, butane, etc. (ii) They have the same functional group. The two characteristics of homologous series are as follows: 1. All members of a homologous series contain the same elements and functional group. Why are certain compounds called hydrocarbons ? The general formula of this series is CnH2n+2. 3. Homologous Series Characteristics: General formula: All the members of a series can be represented by same general formula. Designed by the teachers at SAVE MY EXAMS for the CIE IGCSE Chemistry 0620 / 0971 syllabus. The general formula of this series is CnH2n+2. Characteristics of homologous series: 1. Write the general formula of. STRUCTURAL FORMULA All the members of a homologous series have same structural formula. The members of the homologous series consists of same general formula such as Alkanes have general formula CnH2n+2, 2. Successive members differ from each other by C H 2 .Physical properties change regularly with increasing number of carbon atoms. The general formula for the alkenes is: CnH2n, The first member of the series of alkenes is: Ethane which has formula CH4, Define homologous series of organic compounds list its two characteristics. 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. -CHO group. What is meant by homologous series of carbon compounds ? (iii) Their physical properties such as melting point, boiling point, density, generally show a gradual change with increase of molecular formula in the series. CH 2. are all part of the alkane homologous series. A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group. 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. A homologous series is a family of organic compounds which follows a regular structural pattern, in which each successive member differs in its molecular formula by a –CH 2 – group.. Other homologous series include the alkenes, C n H 2n, the alkanols, C n H 2n+1 OH, and the carboxylic acids, C n H 2n+1 COOH. Homologous series have the following common characteristics.

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