Explanation:
Nucleophilicity \(\alpha \frac{1}{\text { Stability of anion }}\)
order of stability of anion \(\Rightarrow\)
$\mathop {\begin{array}{*{20}{c}}
{\,\,\,\begin{array}{*{20}{c}}
\,\,O \\
\,\,{||}
\end{array}} \\
{C{H_3} - S - {O^\Theta }} \\
{\,\,\,\,||} \\
{\,\,\,\,\,O}
\end{array}}\limits_{(3\,\,equivalent\,\,R.S)} $ $>$ $\underset{(2\,equivalent\,\,R.S)}{\mathop{\begin{matrix}
\,\,\,\,\,O \\
\,\,\,\,|| \\
C{{H}_{3}}-S-{{O}^{\Theta }} \\
\end{matrix}}}\,$ $>$ $\underbrace{C{{H}_{3}}-{{O}^{\Theta }}\,>\,C{{H}_{3}}-CH_{2}^{\Theta }}_{\begin{smallmatrix}
E.N \\
(0\,\,\,>\,\,\,C)
\end{smallmatrix}}$