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The order of stability of the following tautomeric compounds is:
A
II > III > I
B
I > II > III
C
III > II > I
D
II > I > III
Detailed Solution
III is the most stable: it has intramolecular H-bonding and a conjugated system, and it forms through the more acidic $-CH_2-$ hydrogen.
II (the diketo form) has no conjugation.
I is the least stable: it forms through the less acidic H and its C=C is not conjugated with C=O.
Stability: III > II > I
II (the diketo form) has no conjugation.
I is the least stable: it forms through the less acidic H and its C=C is not conjugated with C=O.
Stability: III > II > I