If the carbonyl compound has a hydrogen atom which is present on the alpha carbon atom, then this hydrogen atom can change its position within the molecule and creates equilibrium. keto–enol tautomerism refers to a chemical equilibrium between a carbonyl compound (a ketone or an aldehyde) and an enol (an alcohol). The keto and enol forms are said to be tautomers of each other. Aldehydes and Ketones 37
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