For the following
(i) $I^{-}$ (ii) $C l^{-}$ (iii) $B r^{-}$
the increasing order of nucleophilicity would be:

B r^{-} < C l^{-} < I^{-}

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I^{-} < C l^{-} < B r^{-}

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C l^{-} < B r^{-} < I^{-}

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I^{-} < B r^{-} < C l^{-}

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Solution

The correct option is D $I^{-} < B r^{-} < C l^{-}$
The increasing order of nucleophilicity would be $I^{-} < B r^{-} < C l^{-}$ .
Small sized $C l^{-}$ is more nucleophilic than large sized $I^{-}$ as larger $I^{-}$ ion can better accomodate negative charge.

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