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homologous series organic chemistry

For example: Huckel’s rule states that a cyclic and planar molecule is aromatic if it contains 4n+2 delocalized π electrons, where n = 0,1,2,3,4,etc. The only difference among these molecules is that they have different numbers of CH2 groups. courses that prepare you to earn | {{course.flashcardSetCount}} They differ from each other by one CH2 group. For example: organic compounds having – OH as functional group constitutes a class of compounds called alcohol. The first homologous series is the alkanes. c. Members of a group have same chemical and physical properties. (adsbygoogle = window.adsbygoogle || []).push({}); Want chemistry games, drills, tests and more? Thus, a functional group is defined as an atom or group of atoms linked with carbon which determines characteristic properties of the organic compounds. It’s empirical formula will be : 6. The homologous series is a series of organic compounds that have the same general formula, e.g. Eg. So, if the functional group doesn't change, why are homologous series interesting? Therefore CH2 has a molar mass of 12 + (2 × 1) = 12 + 2 = 14 g mol-1. When organic compounds containing same functional group are arranged in series on the basis of their increasing molecular weight, having the difference of -CH. Carbon chains of varying length have been observed in organic compounds having the same general formula. among the members of the same homologous series. Oxygen – Types of oxides and Uses of hydrogen peroxide. Organic compounds also demonstrate human ingenuity in the vast range of synthetic materials created by chemists. Please enable javascript and pop-ups to view all page content. Already registered? Consider an isomeric mixture of alkenes of molar mass M = 70g/mol. The homologues in a homologous series undergo similar chemical reactions because they have the same functional group. (i) have the same... A homologous series can be described by a general formula. 6 delocalized π – electrons, which is consistant with Huckel’s rule. And we can describe the homologous series of alkynes by a general formula, CnH2n−2. In other words, alkanes are less reactive substances. For example: Each member of homologous series is called homologue and phenomenon of making homologous series is called homology. Earn Transferable Credit & Get your Degree, Organic Chemistry & the Study of Carbon Compound Life Forms, Alcohols & Alkanols: Classification & Functional Group, Structural Isomers: Definition & Examples, What is Pentanol? An organic compound has empirical formula CH2O and molecular weight 90. When organic compounds containing same functional group are arranged in series on the basis of their increasing molecular weight, having the difference of -CH 2 (methylene group) in between two consecutive compounds, such series is called homologous series. Alkyne homologous series contains compounds that: The first member, the first homologue, of the alkyne homologous series must contain 2 carbon atoms which are joined by a triple bond, and, because each carbon atom must make 4 bonds in total, each of the carbon atoms must be bonded to 1 hydrogen atom as shown below: The next member in the series, the next homologue, must contain 3 carbon atoms, and each C atom must make 4 bonds in total: Which is followed by the next homologue with 4 carbon atoms: So once again we can see that we are adding a CH2 unit to one homologue to make the next one in the series. Alkanes are also called paraffins (because they have a little affinity towards a general reagent. Using a mnemonic can make learning the names easier. Ghosh, S.K., Advanced General Organic Chemistry, Second Edition, New Central Book Agency Pvt. Community smaller than society. a group of organic compounds (compounds that contain C atoms) that differ from each other by one methylene (CH2 ) group Visit the Alberta Education Diploma - Chemistry 30: Exam Prep & Study Guide page to learn more. All compounds having the same carbon framework (skeleton) and the same functional group in their molecules possess similar properties. 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.

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