
$-\mathrm{Cl}$ shows $+\mathrm{M}$ and $-\mathrm{I}$ but inductive effect dominates.
$-\mathrm{NO}_2$ shows $-\mathrm{M}$ and $-\mathrm{I}$.
Electrophilic substitution $\alpha \frac{1}{-\mathrm{M} \text { and }-\mathrm{I}}$
$\alpha+\mathrm{M} \text { and }+\mathrm{I}$
Hence, order is $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$.
$(A)\, CH_3 - CH_2 - C \equiv C^-$ $(B) \,CH_3 -CH_2 - S^-$
$(C) \,CH_3 - CH_2 - CO^-_2$ $(D)\, CH_3 -CH_2 - O^-$

${ }^{-} \mathrm{OH}, \mathrm{R} \overline{\mathrm{O}}, \mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}, \mathrm{C} \overline{1}$