Homologous series. Organic compounds in which the terminal C-atoms are not joined together are called open chain compounds. For exampne: Cyclic organic compounds are further classified as – homocyclic and heterocyclic organic compounds. For instance-. First. But in alkenes and alkynes there is a possibility of addition of atoms or groups so they are called unsaturated. Some of the examples of homologous series. flashcard set{{course.flashcardSetCoun > 1 ? Homologous series The series of organic compounds having same general formula and similar chemical properties but different physical properties in which one member differs from other member by single – CH 2 unit is known as homologous series. 10 ORGANIC CHEMISTRY HOMOLOGOUS SERIES The alkanes form a series of compounds all with the general formula C n H 2n+2, e.g. Which of the following is not true about homologous series ? Remember, the functional group is just the area of the molecule that is reactive or can change in chemical reactions. When organic compounds containing same functional group are arranged in series on the basis of their increasing molecular weight, having the difference of -CH. The general formula for members of the alkanol homologous series is CnH2n+2O, The first member of the alkanol homologous series has n=1, so the molecular formula of the first homologue is C1H2×1+2O, that is, CH4O, The second member of the alkanol homologous series has n=2, so the molecular formula of the second homologue is C2H2×2+2O, that is, C2H6O. among the members of the same homologous series. The homologues in a homologous series undergo similar chemical reactions because they have the same functional group. Enrolling in a course lets you earn progress by passing quizzes and exams. Homocyclic compounds : Cyclic organic compounds in which the ring forming atoms are only carbon are called homocyclic or more specifically carbocyclic compounds. Let's learn a little more about homologous series, homologues, and how to identify them. {{courseNav.course.mDynamicIntFields.lessonCount}} lessons (adsbygoogle = window.adsbygoogle || []).push({}); Want chemistry games, drills, tests and more? succeed. These structurally diverse compounds vary from naturally occurring petroleum fuels to DNA and the molecules in living systems. For example: Alkynes : Alkynes are unsaturated hydrocarbons with general formula CnH2n-2. For example, silanes have homologous series. N, O or S ) is present as one of the ring forming atoms are called heterocyclic compounds. The chemical properties of an organic compound solely depend on upon the nature of functional group present in the molecule. Bahl, B.S., A., Advanced Organic Chemistry, S. Chand and company Ltd, New Delhi, 1992. Did you know… We have over 220 college Determine the molecular formula of the alkenes. Alkanol homologous series contains compounds that: The first member of the alkanol homologous series contains just 1 carbon atom which needs to make 4 bonds in total, one of these bonds must be to the OH functional group, so the other 3 bonds must be to hydrogen atoms (H), as shown below: The next homologue contains 2 carbon atoms, each carbon atom must make a total of 4 bonds, one of these bonds is to the OH functional group: The next member of the alkanol homologous series has 3 carbon atoms, all of which must make 4 bonds, and one of those bonds must be to the OH functional group: The difference between the molecular formulae of adjacent homologues is -CH2, which has a molar mass of 14 g mol-1, so the difference in molar mass of adjacent homologues is 14 g mol-1.

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