The correct nucleophilicity order among the following is (a) NH2^->OH^->F^->CH3^- (b) CH3^->NH2^

The correct nucleophilicity order among the following is (a)...

The correct nucleophilicity order among the following is (a) $\mathrm{NH}_{2}^{-}>\mathrm{OH}^{-}>\mathrm{F}^{-}>\mathrm{CH}_{3}^{-}$ (b) $\mathrm{CH}_{3}^{-}>\mathrm{NH}_{2}^{-}>\mathrm{OH}^{-}>\mathrm{F}^{-}$ (c) $\mathrm{OH}^{-}>\mathrm{NH}_{2}^{-}>\mathrm{CH}_{3}^{-}>\mathrm{F}^{-}$ (d) $\mathrm{CH}_{3}^{-}>\mathrm{OH}^{-}>\mathrm{F}^{-}>\mathrm{NH}_{2}^{-}$

The correct nucleophilicity order among the following is
(a) $\mathrm{NH}_{2}^{-}>\mathrm{OH}^{-}>\mathrm{F}^{-}>\mathrm{CH}_{3}^{-}$
(b) $\mathrm{CH}_{3}^{-}>\mathrm{NH}_{2}^{-}>\mathrm{OH}^{-}>\mathrm{F}^{-}$
(c) $\mathrm{OH}^{-}>\mathrm{NH}_{2}^{-}>\mathrm{CH}_{3}^{-}>\mathrm{F}^{-}$
(d) $\mathrm{CH}_{3}^{-}>\mathrm{OH}^{-}>\mathrm{F}^{-}>\mathrm{NH}_{2}^{-}$

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Key Concepts

Electronegativity

Electronegativity affects nucleophilicity as it determines how tightly an atom holds onto its electrons. Atoms with lower electronegativity tend to release electron density more readily, enhancing nucleophilic behavior, while those with higher electronegativity tend to hold electrons more tightly, reducing their nucleophilic reactivity.

Solvation Effects

Solvation effects, especially in polar protic solvents, play a critical role in nucleophilicity. Small, highly charged ions are more strongly solvated, which can diminish their reactivity compared to larger or less solvated ions, thereby affecting the overall nucleophilicity order.

Basicity

Basicity is a measure of a species' ability to accept protons and is often paralleled with nucleophilicity. In many cases, a stronger base is also a stronger nucleophile, although solvent effects and steric hindrance can modify this relationship.

Nucleophilicity

Nucleophilicity refers to the ability of a species to donate an electron pair to an electrophile, initiating a chemical reaction. It is often influenced by factors such as charge, available electron density, and the polarizability of the atom bearing the negative charge.

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