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  4. The decreasing order of nucleophilicity of the following is F -(I), RO -(II), R 2 N -(III), R 3 C -(IV)

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Q. The decreasing order of nucleophilicity of the following is
$F ^{-}(I), RO ^{-}(II), R _{2} N ^{-}(III), R _{3} C ^{-}(IV)$

Organic Chemistry – Some Basic Principles and Techniques

Solution:

In the present case, basicity parallels nucleophilicity. $R _{3} C ^{-}$is the strongest base hence, strongest nucleophile. $F^{-}$is weakest base therefore weakest nucleophile. $R_{2} N^-$ is stronger base and stronger nucleophile than $RO ^{-}$.