All structures given below are of vitamin C. Most stable of them is:

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Canvas Classes · Accepted Answer

The stability of the different tautomeric forms of Vitamin C (ascorbic acid) depends on the extent of conjugation and hydrogen bonding.
In structure (a), the enediol system is conjugated with the lactone carbonyl group, providing resonance stabilization. Also, it allows for strong intramolecular hydrogen bonding, making it the most stable form among the given options.

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