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(C) The reaction of cyclopentanone with dilute $NaOH$ and heat is an intramolecular aldol condensation reaction. $1$. The base $(OH^-)$ abstracts an $

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(C) The reaction of cyclopentanone with dilute $NaOH$ and heat is an intramolecular aldol condensation reaction. $1$. The base $(OH^-)$ abstracts an $\alpha$-hydrogen from the cyclopentanone to form an enolate ion. $2$. This enolate ion attacks the carbonyl carbon of another cyclopentanone molecule to form a $\beta$-hydroxy ketone (aldol). $3$. Upon heating,the $\beta$-hydroxy ketone undergoes dehydration (elimination of water) to form an $\alpha,\beta$-unsaturated ketone. $4$. The structure formed is a cyclopentanone ring attached to a cyclopentylidene group via a double bond. This corresponds to the structure shown in option $C$.

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