The order of stability of the following tautomeric compounds is
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The keto form is most stable in single carbon containing carbonyl compound. It is because the carbon oxygen Pi bond is more stronger than the carbon carbon pi bond. All the ketp form is more stable, there are various other factors which shift the equilibrium towards the enol form like:
Aromaticity- Phenols theoritically exist in their keto forms, but the enol form is also favored due to aromatic stabilization.
Conjugation: stability due to conjugation and resonance.
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