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An '''aldehyde''' is an [[organic chemistry|organic]] compound containing a [[carbon]] to [[oxygen]] double bond (also known as the [[carbonyl]] group). The carbon atom must be attached to at least one [[hydrogen]] atom to be an aldehyde. A common aldehyde is [[formaldehyde]] (CH<sub>2</sub>O), which is a carbonyl group with a hydrogen atom on each side.
Aldehydes differ from [[ketone]]s. While both are similar, ketones require the carbonyl carbon atom to be bonded to two other carbon atoms.<ref>Solomon's Organic Chemistry, Fifth Edition, 1992</ref>
==Notes==
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[[Category:Organic Chemistry]]