The formula of methane is CH4 and the formula of ethane is C2 H6. 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Members of homologous series of functional group aldehyde are:1. A homologous series in organic chemistry is a group of organic compounds (compounds that contain C atoms) that differ from each other by one methylene (CH 2) group. 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. STUDY. To learn more, visit our Earning Credit Page. Our team of exam survivors will get you started and keep you going. PLAY. study Your email address will not be published. Hydrocarbons are compounds that contain only hydrogen and carbon. homologous series. | 9 I’m Imtiaz Ahmed, the learning guide from India. Flashcards. Homologous definition, having the same or a similar relation; corresponding, as in relative position or structure. Organic compounds belonging to the main class can be divided into different families, known as homologous series, on the basis of similarity in structure and chemical properties. just create an account. Such compounds when arranged in order of their molecular masses constitute a series called homologous series and the individual members are called homologues. Homologous series in organic chemistry are like family photos. adj. The name "homologous series" is also often used for any collection of compounds that have similar structures or include the same functional group, such as the general alkanes (straight and branched), the alkenes (olefins), the carbohydrates, etc. A homologous series is a group of chemicals which have similar chemical properties and can be represented by a general formula. To unlock this lesson you must be a Study.com Member. first two years of college and save thousands off your degree. Homologous series is a series of compounds with similar chemical properties and some functional group differing from the successive member by CH 2. 4:03 know what is meant by the terms homologous series, functional group and isomerism A functional group is an atom or a group of atoms that determine the chemical properties of a compound. What Can You Do With an Organic Chemistry Major? Some important series of aliphatic compounds are listed below: If we examine the unbranched alkanes, we notice that each alkane differs from the preceding alkane by one —CH2— group. For example the functional group of an alcohol is the -OH group and that of … You can tell the molecules are similar or related, but they are a little different. Here at EBN, I write about Chemistry, Physics, Biology and Tips & Tricks. At room temperature (25°C) and 1 atm pressure, the first four members of the homologous series of unbranched alkanes are gases, the C5—C17 unbranched alkanes (pentane to heptadecane) are liquids, and the unbranched alkanes with 18 and more carbon atoms are solids. Select a subject to preview related courses: For example, the boiling point of pentane is 36.1o C, while the boiling point of the homologue hexane is 68.7o C. What causes that 30 degree jump in boiling point? A homologous series is a group of chemicals which have similar chemical properties and can be represented by a general formula. Enrolling in a course lets you earn progress by passing quizzes and exams. Within that series, many physical properties such as boiling point gradually change with increasing mass. In that series, successive members differ in mass by an extra methylene bridge (-CH2- unit) inserted in the chain. Required fields are marked *, Organic Chemistry Some Basic Principles and Techniques Notes Class 11, Hydrogen Notes Class 11 Chemistry Chapter 9, Redox Reactions Class 11 Notes Chemistry Chapter 8, Biomolecules Notes Class 12 Chemistry Chapter 14, Sidgwick Powell Theory | Lewis Theory | Octet Rule, BSc Chemistry Question Papers Gauhati University. STANDS4 LLC, 2020. characteristics. 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. A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group. Examples of such series are the straight-chained alkanes, and some of their derivatives. Let's learn a little more about homologous series, homologues, and how to identify them. General formula, functional group and properties of alkanes. VnO2n − 1 for 2 < n < 10), as do the silanes, SinH2n + 2 (with n up to 8) that are analogous to the alkanes, CnH2n + 2. For example, methane, ethane, and propane are part of a homologous series. The reason homologous series are interesting when studying chemistry is because if there is a change in a physical property, it is due to the extra methylene group. © copyright 2003-2020 Study.com. The first homologous series is the alkanes. Try refreshing the page, or contact customer support. A series of compounds of the same family in which each member has the same type of carbon skeleton and functional group, and differs from the next member by a constant difference of one methylene group (−CH2−) in its molecular and structural formula is called as homologous series. a member of. Study.com has thousands of articles about every 106 lessons The numerical value of homologous series in Chaldean Numerology is: 8, The numerical value of homologous series in Pythagorean Numerology is: 8. So, if the functional group doesn't change, why are homologous series interesting? They also carry genes that determine individual traits that can be inherited through reproduction. Thanks for your vote! Chapter 14: Basic Principles of Organic Chemistry. A homologous series is a family of hydrocarbons with similar chemical properties who share the same general formula. Learn. flashcard sets, {{courseNav.course.topics.length}} chapters | Thus the molecular mass of each member differs by 14 atomic mass units. Compounds within a homologous series typically have a fixed set of functional groups that gives them similar chemical and physical properties. Chromosomes are important molecules because they contain DNA and genetic instructions for the direction of all cell activity.

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