The correct order of increasing radii of the ions $B r^{-}, F^{-}, O^{2 -}$ and $S^{2 -}$ is as follows:

B r^{-} < F^{-} < O^{2 -} < S^{2 -}

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S^{2 -} < O^{2 -} < F^{2 -} < B r^{-}

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F^{-} < O^{2 -} < S^{2 -} < B r^{-}

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F^{-} < B r^{-} < O^{2 -} < S^{-}

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Solution

The correct option is A $B r^{-} < F^{-} < O^{2 -} < S^{2 -}$
While going down the group radii increases $($ due to the increase in the number of shells $)$ and radii increases toward left of the group due to fewer Zeffective $.$

So, the correct answer is $A$

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