Assertion :All halogens undergo disproportionation reaction in alkaline medium. Reason: All halogens exhibit variable oxidation states.

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 D Both Assertion and Reason are incorrect
$C l_{2}$ , $B r_{2}$ and $I_{2}$ undergo disproportionation reaction whereas fluorine shows departure being the most electronegative element. Fluorine cannot exhibit positive oxidation state and hence does not show disproportionation tendency.
Fluorine can exhibit only -1 oxidation state.

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