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Aldehyde (alkanal) is the chemical designation for the oxidation product of a primary alcohol, with which the primary hydroxyl group is converted to the group of aldehydes (- CH=O). Most important representatives are formaldehyde and acetaldehyde.

Acetaldehyde appears as primary oxidation product of ethanol. However, it is rapidly continued to oxidize to acetic acid.

Both formaldehyde and acetaldehyde (and their reaction products) are made responsible among other things for the hang-over effect after substantial consumption of alcoholic beverages.