Which of the following does not exhibit tautomerism ?

1.	Which of the following does not exhibit tautomerism ?
Answer» Solution :For tautomerism to occur, at least one `alpha`-hydrogen should be presented on a saturated CARBON NEXT to the keto group. Since in OPTION (a), `alpha`-hydrogens are not present on a saturated carbon and hence it does not SHOW tautomerism. While all, other options CONTAIN `alpha`-hydrogens on saturated carbons next to the keto group and hence show tautomerism.

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