Which one is not correct for a Homologous series ? 1) general formula 2) chemical properties 3) physical properties 4) functional group?

Question

Answer

They have same chemical properties and REGULAR CHANGE IN PHYSICAL PROPERTIES..

Answer

Physical prosperty is not same...

Answer

Physical properties

Answer

Their physical properties such as melting point, boiling point, density, generally show a gradual change with increase of molecular formula in the series.

Answer

Physical properties is the correct answer

Answer

Physical property is not same

Answer

Not Correct for a Homologous Series: Functional Group

Introduction
A homologous series is a group of organic compounds that have similar chemical properties and structural features. These compounds belong to the same family and exhibit a gradual increase in molecular size and complexity. They have a similar general formula and show a gradual change in physical properties as well. However, one aspect that does not hold true for a homologous series is the functional group.

General Formula
One of the defining characteristics of a homologous series is that its members have a general formula. The general formula represents the ratio of atoms in the compound and can be used to predict the molecular structure of all members of the series. For example, in the alkane homologous series, the general formula is CₙH₂ₙ₊₂, where n represents the number of carbon atoms in the compound. Each member of the series, such as methane (CH₄), ethane (C₂H₆), propane (C₃H₈), etc., follows this general formula.

Chemical Properties
Another characteristic of a homologous series is that its members exhibit similar chemical properties. This similarity arises due to the presence of a particular functional group that imparts a specific reactivity pattern to the compounds. For example, in the alcohol homologous series, the functional group is the hydroxyl group (-OH). This functional group is responsible for the characteristic properties of alcohols, such as their ability to form hydrogen bonds, undergo oxidation reactions, and participate in nucleophilic substitution reactions.

Physical Properties
Homologous series also exhibit a gradual change in physical properties as the molecular size increases. For example, in the alkane series, the boiling points and melting points gradually increase with an increase in the number of carbon atoms. This trend can be attributed to the increasing strength of intermolecular forces, such as London dispersion forces, as the size of the molecules increases. Additionally, the solubility, density, and viscosity of compounds within a homologous series also show a similar pattern.

Functional Group
The functional group in organic chemistry refers to a specific atom or group of atoms that determines the compound's chemical behavior or reactivity. While functional groups are essential in organic chemistry, they are not a defining characteristic of a homologous series. Homologous series are primarily defined by their general formula, which represents the ratio of atoms in the compound, their similar chemical properties due to a shared functional group, and their gradual change in physical properties as the molecular size increases.

Conclusion
In summary, the functional group is not a correct characteristic of a homologous series. While functional groups play a crucial role in determining the chemical properties of organic compounds, they are not the defining feature of a homologous series. Homologous series are defined by their general formula, which represents the ratio of atoms in the compound, their similar chemical properties due to a shared functional group, and their gradual change in physical properties as the molecular size increases.

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