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(C) The reaction sequence is as follows:$1$. Aniline reacts with $NaNO_2 + HCl$ at $273-278 \ K$ to form $X$,which is benzene diazonium chloride $(C_6

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$Fittig$ reaction

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(C) The reaction sequence is as follows:$1$. Aniline reacts with $NaNO_2 + HCl$ at $273-278 \ K$ to form $X$,which is benzene diazonium chloride $(C_6H_5N_2^+Cl^-)$.$2$. Benzene diazonium chloride reacts with $Cu_2Br_2/HBr$ (Sandmeyer reaction) to form $Y$,which is bromobenzene $(C_6H_5Br)$.$3$. Bromobenzene reacts with $Na$ in the presence of dry ether. Since only one type of aryl halide is used,this is the $Fittig$ reaction,which produces biphenyl $(Z)$.

In the given reaction sequence,the conversion of $Y$ to $Z$ is:

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