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Among the following the strongest nucleophile is
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$\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{SH}$
Nucleophiles are the species which have tendency to donate a pair of electrons. They can be neutral or negatively charged. The nucleophilic power depends on the tendency of species to donate the electrons. Due to the presence of $+\mathrm{I}$ effect, it increases. Hence, higher the $+\mathrm{I}$ effect, higher the nucleophilic power.
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