What is Homologous Series ?

What is Homologous Series

What is Homologous Series : Homologous series are a sequence of compounds that share the same functional group and have similar chemical properties. Members of a homologous series can be branched or unbranched. They differ only in their molecular formula, which is CH2 in some cases. In some cases, the molecules in a homologous series have the same atomic mass, or 14u, and can have different chemical properties.

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Similar chemical properties

Homologous series of compounds share similar physical and chemical properties. The common characteristic of these compounds is that they have the same functional groups. In other words, they have similar amounts of the same elements and atoms, and their structural features are similar, such as the same number of carbon atoms and hydrogen atoms.

The homologous series is a family of organic chemicals with similar chemical properties. The first series of these compounds are alkanes, alkenes, and cycloalkanes. These organic compounds are based on the same general formula, but they differ in their carbon chain length. The alkanes in this series are insoluble in water. Learning about the chemical properties of alkanes is essential to understanding the different types of hydrocarbons.

Alkanes in the homologous series have similar chemical properties. The only differences between these compounds are in their length and the number of carbon atoms present. These two groups are similar in terms of their boiling point and their pyrolysis fragmentation temperatures, but they differ in terms of vibrational inertia.

In chemistry, homologous series refers to a group of compounds that have the same basic chemical composition but differ by one or more iterations of a specific part of their structure. Examples of homologous series include alkanes and propene. The similarities between homologous compounds are such that it is easy to predict the properties of unknown members of a series by studying a few members in the series.

In addition to the similarities in chemical structure, homologous series also exhibit similar physical properties. The boiling point of each compound in a homologous series increases as the number of units increases. Moreover, as the homologous series continues to ascend, the surface area of each compound increases.

Trend in physical properties

A homologous series of chemical compounds is a group of compounds that have a similar chemical composition and similar properties. They share the same general formula but differ by one simple structural unit. While some compounds of the homologous series exhibit similar physical properties, some do not, and they vary widely from each other. The differences in these properties are sometimes noticed and are known as trends.

What is Homologous Series

One example of this trend is found with the viscosity of a substance. This property is affected by the number of carbon atoms in the molecule and the size of the molecule. For instance, an alkane with a higher molecular mass will have a lower density than a similar alkane with a lower molecular mass. Furthermore, the density of an organic liquid increases with the length of its carbon chain. This is because the larger the carbon chain, the more interactions will occur between the molecules.

Another important trend in physical properties of homologous series is the increasing molecular mass of a homologous compound. This is due to the London dispersion forces. This force largely determines how much a molecule can interact with its neighbors. In general, the larger the molecular mass, the higher its boiling point will be.

Another example of a homologous series is a set of chemical compounds that differ from each other by one or two atomic mass units. The carbon and hydrogen atoms in these compounds are identical, but the chemical properties change as the mass increases. For example, a pentane molecule will have a higher boiling point than a butane molecule.

Classification of homologous series :

Homologous series is a classification of organic compounds that differ in their chemical formulas by one element or group (usually a CH2 group). The same chemical formula can occur in more than one homologous series. The chemical properties of homologous series compounds are generally similar and increase in order of increasing length of the carbon side chain.

Homologous series contain chemical compounds that have the same general formula and share nearly identical chemical properties. Members of these series are also similar in their preparation methods and share the same functional group. This makes them homologous, and therefore the term homologous series is used to describe them.

Homologous series of organic compounds is a classification system that allows scientists to study and predict the properties of a given organic compound by examining similar molecules. Homologous series of organic compounds are characterized by four characteristics: homologous symmetry, similarity of functional groups, similarity of general formula, and almost identical chemistry.

This method uses the quantum chemical principle of isomeric compounds and the systematics of homologous families. In traditional organic chemistry, homologous series are homologous compounds with a variety of functional groups. The total energies of individual compounds are computed by the DFT BLYP and B3LYP methods and applied using gradient optimization. The total number of electrons is then calculated by linear least-squares regressions.

Homologous series of hydrocarbons are compounds with the same general formula but differ in one or more functional groups. For example, pentane has five carbon atoms, while isopentane has one CH3 branch off the second carbon atom. Neopentane, on the other hand, is the successor of pentane and isopentane.


A homologous series is a family of chemical compounds that share the same general formula and are structurally similar. They are typically different only in one parameter, such as molecular mass or structural configuration. As a result, homologous series are often referred to as chemical families or classes.

The similarities between homologous series are not limited to similarities in chemical properties, but they can also include similarity in physical properties. These properties can be seen in alkanes, alcohols, and alkenes, for example. These compounds all share the same functional groups, including hydroxyl groups.

The origin of homologous series was first discovered by French chemist Charles Gerhardt in 1843. The homologation reaction is a chemical process that transforms one homologous series member into the next. The increasing mass of the molecules in a homologous series changes their physical properties. For instance, ethane has a higher boiling point than methane because of the stronger intermolecular attraction between its molecules.

Homologous means that they are similar in structure, function, or appearance. This term is used in biology when two objects share similar features. For example, two triangles that are structurally identical can be referred to as homologous. They also share a common anatomical position.

Examples of homologous series

A homologous series is a collection of compounds that have similar physical and chemical properties. The properties of a homologous series tend to vary slowly throughout the series, and these changes are usually explained by differences in mass or molecular size. These series can be used to study chemical trends.

The term homologous series is also used to describe a group of related organic compounds that have the same chemical formula, but differ only in one unchanging atom. Examples of homologous series include alkanes, cycloalkanes, and alkenes. The alkane hydrocarbon group is an example of a homologous series, and the individual members of this series are similar in both physical and chemical properties.

The first group of homologous series are the hydrocarbons, which have the same general formula. They have similar chemical properties and share a common functional group. These include alkanes, alkenes, alcohols, and cycloalkanes. All of these compounds are saturated and contain carbon and hydrogen. In addition to having similar chemical properties, they share a common method of preparation.

Examples of homologous series of alkanes include cis-9,10-methylene-hexadecane, cis-11,12-methylene-octadecane, and dihydromalvalic acid. These compounds have very similar physical properties and boiling points.