Required fields are marked *. All rights reserved. [3] A homologation reaction is a chemical process that converts one member of a homologous series to the next member. Therefore, the key difference between functional group and homologous series is that functional group is a moiety of a chemical compound that is responsible for the reactivity of that chemical compound whereas homologous series is a sequence of chemical compounds having the similar functional group … All members of the series can be presented by the same general formula, Consecutive members of the series differ by CH2, They have similar chemical properties because they have the same functional group, Their physical properties change in a predictable way. The key difference between functional group and homologous series is that functional group is a moiety of a chemical compound that is responsible for the reactivity of that chemical compound whereas homologous series is a sequence of chemical compounds having the similar functional group and thus, similar chemical reactivity. 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. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. In polymers, the functional groups are attached to the nonpolar core of carbon atoms, giving the polymer its specific characteristic features. They can predict the properties of organic compounds belonging to a particular homologous series based on the data available from the other members of the same series. • The single-ring cycloalkanes form another such series, starting with cyclopropane. Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. Characteristics / Properties of Homologous series :-1. For example, the compounds given below belong to the alcohol family. • Functional group : is an atom or group of atoms in an organic molecule which … These properties typically change gradually along the series, and the changes can often be explained by mere differences in molecular size and mass. The terms functional group and homologous series are two related terms.
Homologous series have the same general formula with the neighbouring members of the series differing by –CH 2 What is a Functional Group Homologous series. All the members of homologous series can be prepared by a common method of preparation.
that depend on the mass and the total number of bonds in a compound show a gradual change with an increase in molecular masses of the compounds. So CH4, C2H6, and C3H8 are homologs. In that series, successive members differ in mass by an extra methylene bridge (-CH2- unit) inserted in the chain. The concept of homologous series was proposed in 1843 by the French chemist Charles Gerhardt. The characteristics of a … It can be represented by the same general formula. Due to the presence of the same functional group, compounds within the same homologous series have similar chemical properties. However, if we cannot arrange the members of the series according to a linear order depending on a single parameter, the compounds collection is called a chemical family or a class of homologous compounds, not a series. consecutive members of the series) – They all differ by CH2. The functional group present in the following molecules are encircled. All the members belonging to this series have the same functional groups. Normally, functional groups attach with a molecule via covalent chemical bonds. This makes the molecule a polyatomic ion. A Homologous series is a group of substances with: the same general formula similar chemical properties because they have the same functional group a trend (graduation) in physical properties
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