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When an oxygen atom forms a double bond to a carbon atom, a carbonyl functional group is obtained.In a ketone, both atoms bonded to the carbonyl carbon are other carbon atoms, and, in an aldehyde, at least one atom on the carbonyl carbon is a hydrogen.A wide range of functional groups are produced by the presence of different atomic groupings on the carbon of the carbonyl group.The carbon atom of a carbonyl group is bonded to two other atoms in addition to the oxygen atom.bond.

When an oxygen atom forms a double bond to a carbon atom, a carbonyl functional group is obtained. The carbon atom of a carbonyl group is bonded to two other atoms in addition to the oxygen atom. A wide range of functional groups are produced by the presence of different atomic groupings on the carbon of the carbonyl group. Two of the most important are aldehydes and ketones. In a ketone, both atoms bonded to the carbonyl carbon are other carbon atoms, and, in an aldehyde, at least one atom on the carbonyl carbon is a hydrogen. Similar to the double bond of alkenes, the carbon-oxygen double bond is made up of a σ bond, whose electron pair lies between the bonded atoms, and a π bond, whose electron pair occupies space on both sides of the σ bond.