Haloalkanes – Nomenclature, Isomerism, Preparation and Properties. first two years of college and save thousands off your degree. Some content on this page could not be displayed. credit by exam that is accepted by over 1,500 colleges and universities. The increase in boiling point is due to increased London dispersion forces, or attractions between the molecules. For example, methane, ethane, and propane are part of a homologous series. Alkanes : Alkanes are the saturated hydrocarbons with general formula CnH2n+2. They all contain the functional group –OH, which is responsible for the properties of alcohols. For example: Each member of homologous series is called homologue and phenomenon of making homologous series is called homology. courses that prepare you to earn All compounds having the same carbon framework (skeleton) and the same functional group in their molecules possess similar properties. I and Vol. Click to investigate the properties of alkanals. N, O or S ) is present as one of the ring forming atoms are called heterocyclic compounds. just create an account. Cyclic organic compounds possessing the properties of aliphatic compounds are called ___ compounds. Homologous series. Failed to subscribe, please contact admin. Some Names of Homologous Series and the Corresponding General... Each … For example: Alkynes : Alkynes are unsaturated hydrocarbons with general formula CnH2n-2. Since each CH2 unit has a molar mass of 14 g mol-1, the difference in molar mass between adjacent homologues is 14 g mol-1. They differ from each other by one CH2 group. 5) There is a regular gradation in the physical properties like melting point, density etc. Their names all end in –ane. One example is silanes. flashcard sets, {{courseNav.course.topics.length}} chapters | You can think of an homologous series as a 'family' or group of compounds, whose chemical behaviour is very similar and whose physical properties show trends when ascending the members of the group (in terms of number of carbon atoms). Try a Free Sample of our revision notes as a printable PDF. The individual members of a homologous series are known as homologous and the process is known as homology. For example: It represents simple whole number ratio of atoms of all the elements in one molecule of the compound. All the members of homologous series have same functional group. For example: 2. 1st. Their molecular masses increases gradually hence their physical properties (eg. II, Prentice Hall, London, 1995. | All Rights Reserved, 3.1.1 Atomic Structure & the Periodic Table, 8.1.1 The Characteristic Properties of Acids & Bases. Finar, I. L., Organic Chemistry, Vol. But in alkenes and alkynes there is a possibility of addition of atoms or groups so they are called unsaturated. The functional group of aldehyde is -CHO. atom other than carbon eg. lessons in math, English, science, history, and more. The homologous series are members of the same series or family with similar chemical properties and similar chemical reactions. 1) All the members of a homologous series contain same general formula and have similar structures. Q) Write down the 1st, IInd, IIIrd and IVth homologue of aldehyde homologous series. Recent developments in chemistry written in language suitable for students. Stay connected with Kullabs. Some examples of functional groups in homologous series are alcohols (-OH), carboxylic acids (-COOH), aldehydes (COH), ketones (C=O), and amines (N), among many others. Services. Homologues have similar chemical properties because the functional group of the molecule does not change. You can find us in almost every social media platforms. All other trademarks and copyrights are the property of their respective owners. You could definitely tell they were related, but they didn't look like carbon copies of each other. The individual members of a homologous series are known as homologous and the process is known as homology. Each member differs from the next by a -CH₂- group. Different members of a homologous series can be denoted by a common formula such as -. Some of the examples of homologous series. b. Homologous series is a series of compounds with similar chemical properties and some functional group differing from the successive member by CH 2. Introduction to Organic Molecules II: Monomers and Polymers, Over 83,000 lessons in all major subjects, {{courseNav.course.mDynamicIntFields.lessonCount}}, Drawing Isomers of Organic Molecules: Practice Problems, Building Molecular Models of Organic Compounds, Comparing Inorganic & Organic Compounds: Explanation & Practice, Comparing Compounds Based on Boiling Point, Alberta Education Diploma - Chemistry 30: Exam Prep & Study Guide, Biological and Biomedical a group of organic compounds (compounds that contain C atoms) that differ from each other by one methylene (CH2 ) group Let's learn a little more about homologous series, homologues, and how to identify them. For example, methane and ethane are homologues and belong to the same homologous series. Which means the difference in the molar mass between adjacent homologues in the series is 14 g mol-1: C has a molar mass of 12 g mol-1 General formula, functional group and properties of alkanes. The alcohols are a homologous series of organic compounds. The general formula of the alkanes is \({C_n}{H_{2n + 2}}\). Occupation, Business & Technology Education, Fundamental Principles of Organic Chemistry, Empirical, Molecular Formula And Limiting Reagents, Introduction to Atomic Mass and Molecular Mass, Avogadro's Hypothesis and Its Application, Introduction to Avogadro's Hypothesis and its Applications, Introduction to Periodic Classification of Elements, Introduction,structure and preparation of Ozone, Introduction to Boron, Silicon and periodic Position, Water Pollution and Greenhouse Effects(Global warming), Preliminary ideas about reaction and Fundamental principles, Nomenclature of Compounds Containing Single Functional Group, Vital Force Theory, Its Limitations, And Definition of Organic Chemistry, Qualitative Analysis of Organic Compounds, Nomenclature of Compounds Containing Polyfunctional Group, Introduction of organic chemistry, classification of organic compounds, Organic Reactions and Preliminary Concept of Reaction Mechanism, Electronic Effects Affecting a Covalent Bond, Organic compound consists of two parts, a reactive (active) part, which is known as a functional group and a skeletal part consisting of carbon and hydrogen atoms, which is known as the alkyl group (Its general formula is C. A functional group is defined as an atom or group of atoms linked with carbon which determines characteristic properties of the organic compounds. Remember, the functional group is just the area of the molecule that is reactive or can change in chemical reactions. First. For instance-. Some important functional group and their class are shown in the table below-. An homologous series is a group of compounds with similar structural features that can be represented by a general formula whose members differ by one -CH 2 - unit. Because the functional group is the same for each molecule in a homologous series, the homologues have similar reactivities.


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