(Solution) - Cycloheptatrienone I is very stable Cyclopentadienone II by contrast is -(2025 Original AI-Free Solution)

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Cycloheptatrienone (I) is very stable. Cyclopentadienone (II) by contrast is quite unstable and rapidly undergoes a Diels-Alder reaction with itself.
(a) Propose an explanation for the different stabilities of these two compounds.
(b) Write the structure of the Diels-Alder adduct of cyclopentadienone.

Cycloheptatrienone (I) is very stable. Cyclopentadienone (II) by contrast is