\[
\mathrm{C_6H_5NH_2}
\xrightarrow[\;273{-}278\,K\;]{\mathrm{HNO_2/HCl}}
X
\xrightarrow{\mathrm{Cu_2Cl_2}}
Y
\]
Conversion of \(X\) to \(Y\) is called
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\[
\boxed{
\mathrm{ArN_2^+X^-}
\xrightarrow{\mathrm{CuCl,\ CuBr,\ CuCN}}
\mathrm{ArCl,\ ArBr,\ ArCN}
}
\]
This substitution of the diazonium group using cuprous salts is called the Sandmeyer reaction.