A Homologous Series is a group of organic chemical compounds, usually listed in order of increasing size, that have a similar structure (and hence, also similar properties) and whose structures differ only by the number of CH2 units in the main carbon chain.
Table of Contents
Do homologous series have different chemical properties?
The 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. This series has enabled scientists and engineers to study different organic compounds systematically.
Which property is same in all the members of homologous series physical or chemical?
(iv) Members of homologous series have similar chemical properties.
What happens to the physical properties in a homologous series?
As the molecular mass increases in any homologous series, a gradation in physical properties is seen. This is because the melting points and boiling points increase with increasing molecular mass. Other physical properties such as solubility in a particular solvent also show a similar gradation.
Why members of homologous series have same chemical but different physical properties?
The chemical properties of homologous series are similar because they have the same functional group. However, the physical properties of homologues are different because of increased London dispersion forces.
What are two properties of homologous series?
- The members of the homologous series have same functional group.
- Members have the same general formula.
- Members have the almost same chemical properties due to same functional group.
- Members have common general method of preparation.
What is homologous series and its properties?
Homologous series: 1 Mark. Characteristics: 4 Marks. The series of organic compounds having same general formula, same functional group and similar chemical properties is called homologous series. Each member of the series is called a homologue.
What are the five properties of homologous series?
- It can be represented by the same general formula.
- It have the same functional group.
- The successive members differ in their molecular formula by –CH2– group, they differ in molecular weight by 14 units.
- It can be prepared by similar chemical methods.
- They show similar chemical properties.
What is homologous series comment on their physical and chemical properties?
Answer: The series which consists of similar structures and similar chemical properties in which the successive compounds differs by a CH 2 group is termed as homologous series. … The members of the homologous series consists of same general formula such as Alkanes have general formula C n H . .
How do you identify a homologous series?
What variation do you see in the physical properties as we move in a homologous series?
In a homologous series. they show a gradual variation in physical properties, such as their boiling points. they have similar chemical properties.
What do all members of a homologous series have?
A homologous series is a family of hydrocarbons with similar chemical properties who share the same general formula. We will look at three hydrocarbon series: alkanes, alkenes and the cycloalkanes. Hydrocarbons are compounds that contain only hydrogen and carbon.
What is the trend of physical and chemical properties of alkanes?
The melting point of alkanes follows the same trend as their boiling point, that is, it increases with an increase in molecular weight. This is attributed to the fact that higher alkanes are solids and it’s difficult to overcome intermolecular forces of attraction between them.
How do the physical properties of the alkene homologous series change as the chain length increases?
The alkanes are a homologous series of hydrocarbons . This means that they have similar chemical properties to each other and they have trends in physical properties. For example, as the chain length increases, their boiling point increases.
What is the two differences between any two groups of homologous series?
b The difference in molecular formula of any two adjacent homologues isi It differs by 14 a.m.u in terms of molecular mass. ii It differs by three atoms. The kind of atoms it differs is one carbon and two hydrogen.
How do members of a homologous series differ from each other?
The successive members of a homologous series are differ by a -CH2 group. The molecular mass of a -CH2 group is 14 amu. Hence, each successive homologue of a homologous series differ by a mass of 14 amu.
What are the properties of homologous series Class 10?
- Each member of the series differs from the preceding or succeeding member by a common difference of CH2 and by a molecular mass of 14 amu. (
- All members of each homologous series contain same elements and same functional groups.
- All members of each homologous series have the same general molecular formula.
What is homologous series state any four characteristics?
Characteristics of a homologous series: Each member of the series differs from the preceding one by the addition of a -CH2 group and by 14 a.m.u. All members of a homologous series share the general formula. Example: The general formula for alkane is CnH2n+2 and alkene is CnH2n.
What is meant by homologous series?
A homologous series is a collection of compounds with the same general formula that differ only in the carbon chain length. Compounds in a homologous series often have a fixed set of functional groups, resulting in chemical and physical properties that are comparable.
What is homologous series Short answer?
A homologous series is a series of compounds with the same general formula, usually varying by a single parameter such as the length of a carbon chain. Compounds within a homologous series typically have a fixed set of functional groups that gives them similar chemical and physical properties.
Why homologous series of compounds are so called?
Solution : Homologous series of carbon compounds are so called because any two consecutive members in any series have the sae common difference of `-CH_(2)` and the difference in the molecular mass is 14 amu. In any homologous series,
(i) Alkyl group determines the physical properties of the compound.
Which of the following belongs to the same homologous series?
A homologous series is a group of organic compounds in which the successive compounds usually differ by CH2. Hence, among the above, the hydrocarbons C3H6 and C4H8 belong to the same homologous series.
What is the difference between functional group and homologous series?
The key difference between functional group and homologous series is that functional group is a moiety of a chemical compound that is responsible for the reactivity of that chemical compound whereas homologous series is a sequence of chemical compounds having the similar functional group and thus, similar chemical …
What is homologous series explain with an example class 10?
Solution : A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group.
For example, methane, ethane, propane, butane, etc. are all part of the alkane homologous series. The general formula of this series is `C_(n)H_(2n)+2`.
What is called homologous series give any three of its characteristics?
All members of a homologous series contain the same elements and functional group. They are represented by a general molecular formula. Eg: Alkanes, C2H2n+2. The members in each homologous series show a regular gradation in their physical properties with respect to their increase in molecular mass.