carbonyl: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “carbonyl” mean?
A functional group in organic chemistry consisting of a carbon atom double-bonded to an oxygen atom (C=O).
Audio
Pronunciation
Definition
Meaning and Definition
A functional group in organic chemistry consisting of a carbon atom double-bonded to an oxygen atom (C=O).
In inorganic chemistry, a metal carbonyl is a coordination complex in which carbon monoxide ligands are bound to a central metal atom (e.g., Ni(CO)4). More broadly, the term refers to any compound containing the carbonyl group, which is central to many organic reactions and biomolecules.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning, usage, or spelling. Pronunciation differences follow general UK/US patterns for the same phonemes.
Connotations
Identical technical connotations.
Frequency
Equally low-frequency outside scientific contexts in both regions.
Grammar
How to Use “carbonyl” in a Sentence
[adjective] + carbonyl (e.g., 'reactive carbonyl')carbonyl + [noun] (e.g., 'carbonyl compound')[metal] carbonyl (e.g., 'iron carbonyl')Vocabulary
Collocations
Examples
Examples of “carbonyl” in a Sentence
verb
British English
- This compound can carbonylate under the reaction conditions.
American English
- The catalyst carbonylates the organic substrate.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Exclusively used in chemistry, biochemistry, and related scientific disciplines.
Everyday
Not used in everyday conversation.
Technical
Core term in organic, inorganic, and organometallic chemistry. Common in research papers, textbooks, and laboratory discussions.
Vocabulary
Synonyms of “carbonyl”
Strong
Neutral
Weak
Vocabulary
Antonyms of “carbonyl”
Watch out
Common Mistakes When Using “carbonyl”
- Misspelling as 'carbonyll' or 'carbonil'.
- Using 'carbonyl' to refer to the carbonate ion (CO3²⁻).
- Incorrect stress placement (should be on the first syllable: CAR-bon-yl).
- Confusing 'carbonyl' (C=O) with 'carboxyl' (COOH).
FAQ
Frequently Asked Questions
No. Carbon monoxide (CO) is a discrete, toxic gas. A carbonyl *group* (C=O) is a functional unit within a larger molecule. However, in 'metal carbonyls', carbon monoxide molecules act as ligands bonded to a metal.
The main families are aldehydes, ketones, carboxylic acids, esters, amides, and acid chlorides. They are distinguished by what is attached to the carbonyl carbon.
It is polar and highly reactive, serving as a key site for countless chemical reactions (e.g., nucleophilic addition). It is also fundamental to the structure and function of many biomolecules like sugars, proteins, and DNA.
A common test is using 2,4-dinitrophenylhydrazine (Brady's reagent) to form a coloured precipitate. Analytically, infrared (IR) spectroscopy shows a strong, characteristic absorption band between 1650-1750 cm⁻¹ for the C=O stretch.
A functional group in organic chemistry consisting of a carbon atom double-bonded to an oxygen atom (C=O).
Carbonyl is usually technical/scientific in register.
Carbonyl: in British English it is pronounced /ˈkɑː.bə.naɪl/, and in American English it is pronounced /ˈkɑːr.bə.nɪl/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “There are no common idioms containing 'carbonyl'.”
Learning
Memory Aids
Mnemonic
Think of CARBON and OXYGEN marrying to form a double bond: CARBON-YL (like 'carbon' + 'yoked'). It's the 'yl' (a common suffix for groups) from carbon that's double-bonded to oxygen.
Conceptual Metaphor
Often described as a reactive 'site' or 'functional handle' on a molecule. In metal carbonyls, CO is a 'ligand' that 'binds' to the metal, often depicted as an arrow donating electron density.
Practice
Quiz
What is the core component of a carbonyl group?