$-\mathrm{Cl}$ 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 $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$.
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$(i)$ Manganese exhibits $+7$ oxidation state in its oxide.
$(ii)$ Ruthenium and Osmium exhibit $+8$ oxidation in their oxides.
$(iii)$ $Sc$ shows $+4$ oxidation state which is oxidizing in nature.
$(iv)$ $Cr$ shows oxidising nature in $+6$ oxidation state.
$\begin{array}{|c|c|c|c|}\hline {} &\text { Molisch's Test} & {\text { Barfoed Test}} & {\text { Biuret Test}} \\ \hline \text { A} & { Positive } & {\text { Negative }} & {\text { Negative }} \\ \hline \text { B } & {\text { Positive }} & {\text { Positive }} & {\text { Negative }} \\ \hline \text { C } & {\text { Negative }} & {\text { Negative }} & {\text { Positive }} \\ \hline\end{array}$
$A, B$ and $C$ are respectively