Circle all the electrophilic carbon atoms in the following structure. Explain your answer. The number of resonance structures (including the one shown) of protonated cyclopent-2-enone is :

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Protonation places the positive charge on the oxygen atom. The C=O π electron pair can then move to the oxygen, forming a carbocation at C1 (the carbonyl carbon). Subsequently, the C=C π electron pair can shift toward C1, resulting in a carbocation at C3. This process generates three resonance structures, with the electrophilic carbons located at C1 and C3. Therefore, the correct answer is (C).

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