Which of the following reaction(s) are feasible?

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 D $C l_{2} + 2 B r^{-} \to 2 C l^{-} + B r_{2}$
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, reaction in option (b) is not feasible.
Reactions in options (a), (c) and (d) are feasible.

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