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  4. Which has the highest nucleophilicity?

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Q. Which has the highest nucleophilicity?

Haryana PMTHaryana PMT 2009

Solution:

A nucleophile is a chemical species that donates an electron pair to an electrophile to form a chemical bond in relation to a reaction Electronegativity - "greed for electrons" - is the opposite of nucleophilicity - "giving away electrons.
So less the electronegativity more the nucleophilicity of ion.
$-{ }^{-} CH _{3}$ has the highest nucleophilicity. Nucleophilicity decreases as
$CH _{3}{ }^{-}> NH _{2}{ }^{-}> OH ^{-}> F ^{-}$