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carbonyl groupA functional group with a carbon atom double-bonded to O2; the 2 remaining bonds are free to attach to other molecules.
Examples of carbonyl compounds
Aldehydes, amides, acyl halides, amides, carboxylic acids, esters, and ketones.
carbonyl group (kärˑ·b·nil grōōpˑ),
n a functional group in which a carbon atom is joined to an oxygen by a double bond; found in aldehydes and ketones.