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  4. Strongest nucleophile is:

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Q. Strongest nucleophile is:

BHUBHU 2003

Solution:

Nucleophile is electron rich or negatively charged species.
$R \overset{\bullet \,\bullet}{ N } H _{2}$ and $\underset{\overset{\bullet \,\bullet}{}}{\overset{\underset{\bullet \,\bullet}{}}{O}} H$ are weaker nucleophile because they don't have negative charge. The strength of $C _{6} H _{5} O ^{-}$, decreases due to presence of benzyl group which withdraws electrons from oxygen due to $-I$ effect. $CH _{3} O ^{-}$is strongest nucleophile because methyl group increases the electron density on oxygen, since it shows $+I$ effect.