Answer:
Hydrated form of hexafluoroacetone is highly stable.
Explanation:
Hydrated form of hexafluoroacetone is highly stable due to presence of two five membered ring structures formed through hydrogen bonding between F and H (in -OH group).
Due to this stable structure, [tex]H_{2}O[/tex] can not escape the hydrated form and goes back to keto form.
The structure of hydrated form of hexafluoroacetone has been shown below.