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Tautomerism – keto–enol
Concepts tested here
- bicyclic-tautomerism
All Questions
2016 Phase II 1 question
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Which among the given molecules can exhibit tautomerism?
Tautomerism needs an enolisable $\alpha$-H.
Only III has an $\alpha$-hydrogen that can shift to form a stable enol; in I the $\alpha$-carbons are bridgeheads (enol would violate Bredt's rule) and in II the $\alpha$-carbon has no H.