How does acetylene react with water to form acetaldehyde?

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Acetylene reacts with water through a process known as hydration to form acetaldehyde. This reaction typically requires the presence of mercuric salts as a catalyst.1

During this chemical transformation, the initial product formed is an unstable compound called an enol, which is characterized by an H–O–C=C– group. Because this enol is unstable under the conditions of its formation, it undergoes a structural rearrangement to become an isomer containing a carbonyl group, resulting in the final product, acetaldehyde (CH3CHO).21