Aldehydes have a functional ·CHO group. Many six-carbon (e.g. glucose), five-carbon (e.g. ribose) or four-carbon sugars (e.g. erythrose) have a functional aldehydic carbon. Aldehydes are intermediates when a functional alcohol carbon is converted to an acid carbon. Aldehydes such as formaldehyde and acetaldehyde are highly toxic and react with tissues.
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