Which one of the following reaction does not occur ?

F_{2} + 2 C l^{-} \to 2 F^{-} + C l_{2}

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C l_{2} + 2 F^{-} \to 2 C l^{-} + F_{2}

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B r_{2} + 2 I^{-} \to 2 B r^{-} + I_{2}

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C l_{2} + 2 B r^{-} \to 2 C l^{-} + B r_{2}

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Solution

The correct option is B $C l_{2} + 2 F^{-} \to 2 C l^{-} + F_{2}$
Reduction potential (tendency to accept electrons and decrease in oxidation state) of halogens is in the order $F_{2} > C l_{2} > B r_{2} > I_{2} .$
This means fluorine can be reduced to fluoride ions by $C l^{-}, B r^{-}$ and $I^{-}$ ions. The reverse process of fluoride conversion to fluorine by any other halogen will not be possible.
So, option (b) is the correct answer.

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