When E_2 competition is not a concern,which o | vedclass

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(D) In an $S_N2$ reaction,the rate depends on the strength of the nucleophile. $A$ stronger nucleophile is typically a stronger base,provided the ster

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$OH^-$

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(D) In an $S_N2$ reaction,the rate depends on the strength of the nucleophile. $A$ stronger nucleophile is typically a stronger base,provided the steric hindrance is not significant. Comparing the given nucleophiles: $1$. $H_2O$ is a neutral molecule and a weak nucleophile. $2$. $Cl^-$ is a weak nucleophile in polar protic solvents due to solvation. $3$. $HCOO^-$ (formate ion) has resonance stabilization,which reduces the availability of the lone pair,making it a weaker nucleophile compared to $OH^-$. $4$. $OH^-$ is a strong,small,and highly reactive nucleophile. Therefore,$OH^-$ is the best nucleophile among the given options for an $S_N2$ reaction when $E_2$ competition is ignored.

When $E_2$ competition is not a concern,which of the following is the best nucleophile for an $S_N2$ reaction?

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