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