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Lewis Kossel Structure

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Question

We know that large size of a donour atom increases nucleophilicity. Then why in case of a polar aprotic solvent , the nucleophilicity trend for halide ions is- F->Cl->Br->I-??

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Solution

Dear student,In non polar solvents,the solvation factor is absent. Bigger anions are still more polarizable and can interact in a better way with the LUMO.Also naked” anions are highly reactive both as bases and nucleophiles.So order gets reversed.

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Q. In an Aprotic solvent, which relative ordering best describes the nucleophilicity of the halide ions?

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

Statement - 2 : Due to bigger size of

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it is less solvated in polar protic solvent.

Q. Statement-1: Nucleophilicity order in polar-protic solvent is:

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

Statement-2: Due to bigger size of

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Q. Statement-1: The order of nucleophilicity in a polar-protic solvent is:

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

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Q. The nucleophilicity order of halogens in polar aprotic solvent is

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