Which among the given molecules can exhibit t | vedclass

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(A) Tautomerism in carbonyl compounds requires the presence of an $\alpha$-hydrogen atom to form an enol. Additionally,the formation of the enol must

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$III$ only

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(A) Tautomerism in carbonyl compounds requires the presence of an $\alpha$-hydrogen atom to form an enol. Additionally,the formation of the enol must not violate $Bredt's$ $Rule$,which states that a double bond cannot be placed at the bridgehead of a bridged bicyclic system unless the ring is large enough.$I$: This is bicyclo[$2.2$.$1$]heptan$-2-$one. The $\alpha$-hydrogen is present,but forming the enol would place a double bond at the bridgehead,violating $Bredt's$ $Rule$.$II$: This is $3,3-$diphenylbicyclo[$2.2$.$1$]heptan$-2-$one. Similar to $I$,the enol form would violate $Bredt's$ $Rule$.$III$: This is bicyclo[$2.2$.$1$]heptan$-2-$one (specifically the isomer where the carbonyl is at the $2-$position). The enol form can be formed by removing an $\alpha$-hydrogen from the $C_3$ position,which does not violate $Bredt's$ $Rule$ as the double bond is not at the bridgehead.Therefore,only molecule $III$ can exhibit tautomerism.

Which among the given molecules can exhibit tautomerism?

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