Chemical properties of the members of a homologous series are the same due to the fact that they all have the same functional groups in them. The single-ring cycloalkanes form another such series, starting with cyclopropane. • Functional group : is an atom or group of atoms in an organic molecule which … They can predict the properties of organic compounds belonging to a particular homologous series based on the data available from the other members of the same series. All the members of homologous series can be prepared by a common method of preparation. All members of the series can be presented by the same general formula, Consecutive members of the series differ by CH2, They have similar chemical properties because they have the same functional group, Their physical properties change in a predictable way. Homologous series is a series of compounds with similar chemical properties and some functional group differing from the successive member by CH2. 2. • They have similar physical properties that follow a fixed gradation with increasing mass. A homologous series is a group of compounds with similar characteristics and the same general formula. Generally, functional groups are very important in different aspects; in identifying unknown molecules, in determining end products of reactions, in chemical synthesis reactions for the designing and synthesis of new compounds, etc. consecutive members of the series) – They all differ by CH2. Adjacent members in such a series, such as methane and ethane, are known as "adjacent homologues".[4]. However, they are clearly structurally different. For example in CH4 and C2H6, the difference is -CH2 unit and the difference between C2H6 and C3H8   is also -CH2 unit. The general characteristics of a homologous series are: (i) All compounds in the series are composed of the same elements and contain the same functional group. In which series is conjugated bond found?Is it consistent along the series? For example, the compounds given below belong to the alcohol family. They tend to all act the same in a chemical reaction. Some common examples for functional groups include hydroxyl group, carbonyl group, aldehyde group, ketone group, carboxyl group, etc. Therefore, properties such as melting and boiling point, solubility, etc. One of the features of a homologous series is that each and every member of a series includes at least one functional group. Chemicals in the same homologous series will show a gradual variation in one property (eg. Required fields are marked *. Alkene formula is written as CnH2n. Despite the fact that they have the exact same number and types of atoms, they have a different structure due to the position of the functional group in the molecule. To which homologous series does ethanol belong? Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. 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Characteristics of a homologous series 1) All the members of a homologous series contain same general formula and have similar structures, 2) Two successive members of a series are different in their molecular formula by a -CH 2 unit or 14 atomic mass (a.m.u). When other atoms or groups are attached to an alkyl radical they can form a different series of compounds. The homologous series of straight-chained alkanes begins methane (CH4), ethane (C2H6), propane (C3H8), butane (C4H10), and pentane (C5H12). In organic chemistry, a homologous series is a series of compounds with the same functional group. Homologous series have the same general formula with the neighbouring members of the series differing by –CH 2

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