- AForm sulphur halides
- BAre oxidised
- ✓Are reduced
- DNone of these
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$(A)$ $\left[ Cr \left( NH _3\right)_5 Cl ^2 Cl _2\right.$ and $\left[ Cr \left( NH _3\right)_4 Cl _2\right) Cl$
$(B)$ $\left[ Co \left( NH _3\right)_4 Cl _2\right]^{+}$and $\left[ Pt \left( NH _3\right)_2\left( H _2 O \right) Cl \right]^{+}$
$(C)$ $\left[ CoBr _2 Cl _2\right]^{2-}$ and $\left[ PtBr _2 Cl _2\right]^{2-}$
$(D)$ $\left[ Pt \left( NH _3\right)_3\left( NO _3\right) Cl\right.$ and $\left[ Pt \left( NH _3\right)_3 Cl \right] Br$

$I$. $-I$ Effect of nitro group.
$II$. Greater resonance effect of $p-$ nitrophenoxy group
$III$. Steric effect of bulky nitro group
$\xrightarrow{{Mg/THF}}A\mathop {\xrightarrow{{(i)\,C{H_3}CHO}}}\limits_{(ii)\,aq.N{H_4}Cl} B$
( $Ba = 137,\,\,Cl = 35.5,\,\,S = 32,\,\,H = 1$ and $O = 16$ )
$2H_2O(g) \rightleftharpoons 2H_2(g) + O_2(g); K_1 = 2.1 \times 10^{-13}$
$2CO_2(g) \rightleftharpoons 2CO(g) + O_2(g); K_2 = 1.4 \times 10^{-12}$