Assertion : Chlorine undergoes disproportionation reaction in...

Assertion : Chlorine undergoes disproportionation reaction in alkaline medium. Reason :

\mathrm{Cl}_2

is an oxidising agent.

Options

AIf both assertion and reason are true and reason is the correct explanation of assertion.
BIf both assertion and reason are true but reason is not the correct explanation of assertion.
CIf assertion is true but reason is false.
DIf both assertion and reason are false.

B. If both assertion and reason are true but reason is not the correct explanation of assertion.

\begin{aligned} & \text{ }: \mathrm{Cl}_2+2 \mathrm{NaOH} \text{ (dil.) } \underset{\mathrm{cold}}{\longrightarrow} \\ & 3 \mathrm{Cl}_2+6 \mathrm{NaOH} \text{ (conc.) } \underset{5 \mathrm{NaCl}}{\stackrel{\text{ heat }}{\longrightarrow}}+\mathrm{NaOCl}+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{NaClO}_3+3 \mathrm{H}_2 \mathrm{O}\end{aligned}

Chlorine undergoes the

simultaneous oxidationreduction. Chlorine is simultaneously reduced to chloride ion

\left(\mathrm{Cl}^{-}\right)

and is oxidised to either

\mathrm{ClO}^{-}

or

\mathrm{ClO}_3^{-}ion. Halogens (e.g. Cl) have a strong tendency to accept electrons, so they act as strong oxidising agents.