+The carbonyl group (C=O) is a fundamental [functional group](/wiki/functional_group) in organic chemistry, comprising a carbon atom double-bonded to an oxygen atom. This reactive core defines the properties of many important compounds, including [ketones](/wiki/ketone) and aldehydes, influencing their structure and chemical behavior.
+## See also
+- [Aldehyde](/wiki/aldehyde)
+- [Carboxylic acid](/wiki/carboxylic_acid)
+- [Ester](/wiki/ester)
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