Determine the molecular formula of the alkenes. Read about our approach to external linking. Designed by the teachers at SAVE MY EXAMS for the CIE IGCSE Chemistry 0620 / 0971 syllabus. A homologous series is a family of hydrocarbons with similar chemical properties who share the same general formula. first two years of college and save thousands off your degree. Visit the Alberta Education Diploma - Chemistry 30: Exam Prep & Study Guide page to learn more. | All Rights Reserved, 3.1.1 Atomic Structure & the Periodic Table, 8.1.1 The Characteristic Properties of Acids & Bases. The alkanes, alkenes and cycloalkanes are examples of homologous series. Choose the correct answer: The compounds CH_3CH_3 and CH_3CH_2CH_3 are A) Isomer B) Allotropes C) Isotopes D) Homologs, Working Scholars® Bringing Tuition-Free College to the Community. The homologous series is a series of organic compounds that have the same general formula, e.g. courses that prepare you to earn There are 3 double bonds i.e. Click to investigate the properties of alkanals. Homologous Series This is a series or family of organic compounds that have similar features and chemical properties due to them having the same functional group All members of a homologous series have: The same general formula 6 delocalized π – electrons, which is consistant with Huckel’s rule. Alkanes are also called paraffins (because they have a little affinity towards a general reagent. 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 Examples : It represents actual number of atoms of all the elements present in one molecule of the compound. In the field of organic chemistry, a homologous series is a sequence of compounds with the same functional group and similar chemical properties in which the members of the series can be branched or unbranched. Get access risk-free for 30 days, Hexane has more carbon and hydrogen atoms than pentane, so it has more London dispersion forces. The formula which represents the simple whole number ratio of different atoms present in one molecule of a compound is known as : a. Molecular formula   c. Condensed formula, b. Empirical formula    d. Electron dot formula. | {{course.flashcardSetCount}} c. Butane, 2-methylpropane, 2-methylbutane, d. Chloroathane, 2-chloropropane, 1-chlorobutane. Alkenes are also called olefins ( i.e. Ghosh, S.K., Advanced General Organic Chemistry, Second Edition, New Central Book Agency Pvt. For example: Each member of homologous series is called homologue and phenomenon of making homologous series is called homology. It’s molecular formula will be : 5. To unlock this lesson you must be a Study.com Member. Their molecular masses increases gradually hence their physical properties (eg. Carbon chains of varying length have been observed in organic compounds having the same general formula. In this type of formula, carbon and hydrogen atoms are not shown and only hetero atoms are shown. [IUPAC- International Union of Pure and Applied Chemistry]. oil forming because they form oily liquids on reaction with chlorine gas. | 9 Ltd., Kolkatta, 2007. https://www.britannica.com/science/homologous-series. The only thing that will change is the length of the carbon chain. Using a mnemonic can make learning the names easier. We've partnered with The Profs to give you access to the very best tutoring experience. melting point and boiling point) changes gradually. For the first member of the series (the first homologue), n=2, so the molecular formula for this compound will be C2H2×2−2 which is C2H2, For the second member of the series (the second homologue), n=3, so the molecular formula for this compound will be C3H2×3−2 which is C3H4.

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