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In acyclic `alpha-`diketones the equilibrium lies essentially completely over in favour of the keto form, because acyclic form can take up anti-conformation in which the two oxygen atoms are far from each other as possible. In cyclic `alpha-`diketones (Y). The carbonyl groups are locked in the syn conformation in both keto and enol forms and the intramolecular hydrogen bonding open to enol form.
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