Given, Which of the given compounds can exhibit tautomerism?

Step-by-step solution

All compounds show tautomerism. Of many types of tauomerism possible, keto-enol tauomerism is the most commonly encountered one. It is possible in presence of α -C (wrt the carbonyl group), which is the conjugate C-H bond having sp 3 hybridization. Usually it is the α -C of the carbonyl group constituting a triad system, however it could also sometimes be the γ -C, if there is a C=C present on α - β carbons, constituting a quinquad system. Compound (I) & (II) are have tautomerism in a triad