\(\begin{array}{l}
C{l_2} + {H_2}O \to HCl + HClO\\
2HClO \to 2HCl + {O_2}\\
HCl + NaOH \to NaCl + {H_2}O\\
C{l_2} + 2NaBr \to 2NaCl + B{r_2}\\
B{r_2} + 2NaI \to 2NaBr + {I_2}\\
C{l_2} + {H_2} \to 2HCl\\
Fe + 2HCl \to FeC{l_2} + {H_2}\\
FeC{l_2} + 2NaOH \to 2NaCl + Fe{(OH)_2}
\end{array}\)