Assertion :Chlorine undergoes disproportionation reaction in alkaline medium. Reason: $C l_{2}$ is an oxidising agent.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$C l_{2} + 2 N a O H (d i l .) c o l d - - \to N a C l + N a O C l + H_{2} O$

$3 C l_{2} + 6 N a O H (c o n c .) h e a t - - \to 5 N a C l + N a C l O_{3} + 3 H_{2} O$

Chlorine undergoes the simultaneous oxidation-reduction. Chlorine is simultaneously reduced to chloride ion $(C l^{-})$ and is oxidised to either $C l O^{-}$ or $C l O_{3}^{-}$ ion. Halogens (e.g. Cl) have a strong tendency to accept electrons, so they act as strong oxidising agents.

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