Question

Why doesn't lactic acid show tautomerism?​

Answer 1

Explanation:

There is equivalent resonance on two oxygen atoms of acetic acid, thus they don't take part in resonance with any other charged atom.

Thus negative charge which comes on C and doesn't shift as it shifts in resonance to other atoms, therefore in acetic acid due to localisation of charge on same C atom, tautomerism is not possible.

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