Question detail

Which of the following best describes the relationship between homologous series and 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. Functional groups are a subset of homologous series.
B. Homologous series are defined by their functional groups.
C. Functional groups can exist independently of homologous series.
D. Homologous series and functional groups are completely unrelated.

Answer

Homologous series are defined by their functional groups.

Explanation

Homologous series are defined as groups of compounds that share the same functional group, which leads 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 accurately describes the relationship 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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