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A carbonyl group contains a carbon atom which is doubly bonded to an oxygen atom (C=O). The main difference between Aldehyde and Ketone is their chemical structure; even though both aldehydes and ketones share a carbonyl centre within their chemical structure, their chemical arrangement of the surrounding atoms is different.What is the best description of a carbonyl group?
The Carbonyl Group. As a result, the carbonyl group is best described as a hybrid of the following resonance structures. We can represent the polar nature of this hybrid by indicating the presence of a slight negative charge on the oxygen ( d -) and a slight positive charge ( d +) on the carbon of the C=O double bond.