Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
a class of compounds
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a class of compounds" is correct and usable in written English.
It can be used in scientific or technical contexts to refer to a specific group of chemical compounds that share similar properties or structures. Example: "In this study, we will focus on a class of compounds known for their antibacterial properties."
✓ Grammatically correct
Science
News & Media
Encyclopedias
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
In 1996, Norvir became the second marketed protease inhibitor, a class of compounds crucial to most AIDS drug regimens.
News & Media
Both Avandia and Actos, the Takeda drug, are members of a class of compounds with a troubled history.
News & Media
His focus was on a class of compounds, luciferin, that are bioluminescent.
News & Media
It was the first of a class of compounds called metal carbonyls to be discovered (1890).
Encyclopedias
In general, within a class of compounds, smaller molecules are more volatile than larger ones.
Encyclopedias
Flavanols are a class of compounds that plants produce for self-defense.
News & Media
It is a vanilloid, a class of compounds that include vanillin, found in vanilla; eugenol, found in cloves and cinnamon; and zingerone, found in ginger.
News & Media
Vitamins, a class of compounds with a variety of chemical structures, are needed by animals in small amounts.
Encyclopedias
Polystyrene foam was formerly made with the aid of chlorofluorocarbon blowing agents—a class of compounds that has been banned for environmental reasons.
Encyclopedias
These are members of a class of compounds called carbohydrates, substances with formulas that are multiples of the simple formula CH2O.
Encyclopedias
Steroids, a class of compounds of great importance in both plants and animals, are not isoprenoids but are derived directly from them.
Encyclopedias
Expert writing Tips
Best practice
When using "a class of compounds", ensure you clearly define the shared characteristics or properties that unite the compounds within that class. This provides clarity and context for your audience.
Common error
Avoid using "a class of compounds" without specifying the relevant criteria. For instance, instead of saying "this affects a class of compounds", be specific: "this affects a class of compounds containing aromatic rings".
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a class of compounds" functions as a noun phrase, typically serving as a subject or object in a sentence. It identifies a group of chemical substances that share common properties or characteristics, as confirmed by Ludwig.
Frequent in
Science
70%
Encyclopedias
15%
News & Media
15%
Less common in
Formal & Business
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "a class of compounds" is a grammatically correct and frequently used phrase, particularly in scientific and technical contexts. Ludwig AI confirms its common usage to categorize chemical substances with shared properties. While it is primarily used in formal settings, ensuring clarity by specifying the defining characteristics of the class is crucial. Alternatives such as "a group of substances" or "a family of chemicals" can be used depending on the context, but the phrase remains a standard and versatile way to classify chemical entities. The most authoritative sources that provide usage examples of the expression are Encyclopedia Britannica, The New York Times and Science Magazine.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a group of substances
Replaces "class" with "group" and "compounds" with the broader term "substances", maintaining a general reference to chemical entities.
a family of chemical substances
Substitutes "class" with "family" and uses "chemical substances" instead of "compounds", implying a shared origin or characteristics.
a set of chemical entities
Replaces "class" with "set" and "compounds" with "chemical entities", providing a more formal and precise alternative.
a category of molecules
Uses "category" instead of "class" and "molecules" instead of "compounds", focusing on the molecular aspect.
a series of related chemicals
Emphasizes the relationship between the chemicals, using "series" instead of "class".
a collection of chemical species
Replaces "class" with "collection" and "compounds" with "chemical species", denoting a varied assembly of chemicals.
a division of molecular structures
Focuses on the structural aspect, using "division" instead of "class" and "molecular structures" for "compounds".
a classification of chemical agents
Uses "classification" instead of "class" and "chemical agents" instead of "compounds", broadening the scope to include reactive substances.
a spectrum of organic molecules
Highlights the range of molecules, using "spectrum" instead of "class" and specifies "organic molecules".
a cluster of interconnected elements
Moves beyond strict chemical terminology to emphasize the interconnectedness of elements within the group.
FAQs
How can I use "a class of compounds" in a sentence?
You can use "a class of compounds" to refer to a group of substances sharing similar characteristics. For example, "Flavonoids are "a class of compounds" known for their antioxidant properties".
What is an example of "a class of compounds"?
An example of "a class of compounds" is steroids, which includes substances like cholesterol and testosterone, all derived from isoprenoids.
What can I say instead of "a class of compounds"?
Alternatives include "a group of substances", "a family of chemicals", or "a category of molecules" depending on the specific context and the level of formality required.
How does "a class of compounds" differ from "a specific compound"?
"A class of compounds" refers to a group sharing similar structural or functional features, while "a specific compound" refers to an individual substance with a unique molecular structure and properties.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested