Question detail

What defines a functional group in organic chemistry?

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. A specific group of atoms within a molecule that is responsible for its characteristic reactions.
B. A series of compounds that differ by a constant increment in molecular mass.
C. A type of isomer that has the same molecular formula but different structural arrangements.
D. A group of compounds that can only undergo elimination reactions.

Answer

A specific group of atoms within a molecule that is responsible for its characteristic reactions.

Explanation

A functional group is defined as a specific group of atoms that gives a compound its characteristic chemical properties. The key difference is that a homologous series refers to a broader category of compounds with similar properties due to the same functional group. Functional groups apply when identifying the reactive parts of individual compounds, while homologous series applies to groups of compounds. Thus, the first option accurately describes a functional group.

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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