Question detail

Which statement best distinguishes a homologous series from functional groups?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Introduction to organic chemistry

Question

A. Homologous series have varying functional groups, while functional groups are consistent across a series.
B. Homologous series consist of compounds with the same functional group, while functional groups are specific reactive parts of molecules.
C. Homologous series are defined by their molecular weight, while functional groups are defined by their molecular formula.
D. Homologous series can only contain alkanes, while functional groups can be found in all organic compounds.

Answer

Homologous series consist of compounds with the same functional group, while functional groups are specific reactive parts of molecules.

Explanation

A homologous series is defined as a group of compounds that share the same functional group, leading to similar chemical properties. The key difference is that functional groups are specific groups of atoms responsible for the characteristic reactions of a compound. Homologous series applies when discussing groups of compounds with a consistent structure, while functional groups apply to the specific reactive parts of those compounds. Therefore, the second option correctly distinguishes between the two concepts.

Common mistake

Homologous Series vs Functional Groups

Students often confuse homologous series with functional groups, thinking they are the same concept.

A homologous series is a group of organic compounds that have the same functional group and similar chemical properties, differing by a constant unit (usually -CH2). A functional group is a specific group of atoms within a molecule that is responsible for the characteristic reactions of that molecule. Homologous series applies when discussing groups of compounds with similar properties, while functional groups apply when identifying reactive parts of individual molecules. Understanding this distinction helps in naming and predicting reactions of organic compounds.

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