Extraction of chlorine from brine solution is based on

Chloride is obtained by the electrolysis of brine solution (conc. NaCl solution). Chlorine is liberated at the anode the sodium metal is liberated at the cathode and reacts with water to form \(\mathrm{NaOH}\) and \(\mathrm{H}_{2}\)
At anode oxidation takes place:
\[
\begin{array}{l}
\mathrm{Cl}^{-} \rightarrow \mathrm{Cl}+e^{-} \\
\mathrm{Cl}+\mathrm{Cl} \rightarrow \mathrm{Cl}_{2}
\end{array}
\]
At cathode reduction takes place:
\(\mathrm{Na}^{+}+e^{-} \rightarrow \mathrm{Na}\) \(2 \mathrm{Na}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{~N} a \mathrm{OH}+\mathrm{H}_{2}\)
Therefore, extraction of chlorine from brine solution is based on oxidation.