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Q. The nucleophilicity of $F^{-}$ is higher in case of

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

The nucleophilicity of $F^{-}$ is higher in case of DMSO (Polar aprotic solvent) as there is no hydrogen bonding in such solvents.

Here $F^{-}$ is a better nucleophile in polar protic solvents where its nucleophilicity decreases due to hydrogen bonding.

In polar aprotic solvents, the order of nucleophilicity is reversed:

$F^{-}>Cl^{-}>Br^{-}>I^{-}$