Among the following,the strongest nucleophile | vedclass

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(A) The correct answer is $A$. Nucleophilicity is the ability of a species to donate an electron pair to an electrophile. Factors affecting nucleophil

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$C_2H_5SH$

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(A) The correct answer is $A$. Nucleophilicity is the ability of a species to donate an electron pair to an electrophile. Factors affecting nucleophilicity include charge,electronegativity,and solvent effects. Comparing the given species: $1$. $C_2H_5SH$ (Ethanethiol): Sulfur is less electronegative than oxygen and nitrogen,making its lone pair more available for donation. $2$. $CH_3COO^-$ (Acetate ion): The negative charge is delocalized over two oxygen atoms via resonance,which decreases its nucleophilicity. $3$. $CH_3NH_2$ (Methylamine): Nitrogen is more electronegative than sulfur,making its lone pair less available. $4$. $NCCH_2^-$ (Cyanomethyl anion): The negative charge is stabilized by the strong electron-withdrawing $-I$ and $-M$ effect of the cyano $(-CN)$ group,significantly reducing its nucleophilicity. Therefore,$C_2H_5SH$ acts as the strongest nucleophile among the given options due to the lower electronegativity of sulfur compared to oxygen and nitrogen,and the lack of resonance stabilization or strong electron-withdrawing groups.

Among the following,the strongest nucleophile is

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