Correct order of nucleophilicity for S_N2 rea | vedclass

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(B) Nucleophilicity is defined as the ability of a species to donate an electron pair to an electrophilic carbon atom. For $S_N2$ reactions,nucleophil

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$OH^{-} > CH_3COO^{-} > H_2O$

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(B) Nucleophilicity is defined as the ability of a species to donate an electron pair to an electrophilic carbon atom. For $S_N2$ reactions,nucleophilicity generally correlates with basicity when the attacking atoms are the same or in the same period. Comparing the basicity: $OH^{-}$ is a strong base. $CH_3COO^{-}$ is a weaker base due to resonance stabilization of the negative charge. $H_2O$ is a neutral molecule and is the weakest nucleophile among the three. Therefore,the order of nucleophilicity is $OH^{-} > CH_3COO^{-} > H_2O$.

List-$I$ (Reaction)	List-$II$ (Mechanism)
$A$. Williamson Synthesis	$I$. Electrophilic addition
$B$. Friedel-Crafts Reaction	$II$. Free radical substitution
$C$. Bromination of vinyl benzene	$III$. Nucleophilic substitution
$D$. Chlorination of toluene in light	$IV$. Electrophilic substitution

Correct order of nucleophilicity for $S_N2$ reaction

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