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(C) The reaction of cyclopentanone with $Al(Hg)$ in benzene followed by hydrolysis is a reductive coupling reaction known as the pinacol coupling. $1$

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(C) The reaction of cyclopentanone with $Al(Hg)$ in benzene followed by hydrolysis is a reductive coupling reaction known as the pinacol coupling. $1$. The aluminum amalgam $(Al(Hg))$ acts as a reducing agent,donating electrons to the carbonyl group of the cyclopentanone to form a ketyl radical anion. $2$. Two of these ketyl radical anions undergo dimerization to form a di-alkoxide intermediate. $3$. Subsequent hydrolysis with $H_2O$ protonates the alkoxide ions to yield the final product,which is a pinacol ($1$,$2$-diol). $4$. The structure formed is $1,1'-bi(cyclopentane)-1,1'-diol$.

In the reaction,the product $(X)$ is

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