- ASalicylaldehyde
- B$p-$ hydroxy benzaldehyde
- ✓Both $(a)$ and $(b)$
- DChloretone

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$\begin{array}{*{20}{c}}{CHO}\\|\\{HCOH}\\|\\{HOCH}\\|\\{HCOH}\\|\\{C{H_2}OH}\\I\end{array}$ $\begin{array}{*{20}{c}}{CHO}\\|\\{HCOH}\\|\\{HCOH}\\|\\{HOCH}\\|\\{C{H_2}OH}\\{II}\end{array}$ $\begin{array}{*{20}{c}}{CHO}\\|\\{HCOH}\\|\\{HCOH}\\|\\{HCOH}\\|\\{C{H_2}OH}\\{III}\end{array}$

$2 Fe _{( s )}+ O _{2( g )}+4 H _{( aq )}^{+} \rightarrow 2 Fe _{( aq )}^{2^{+}}+2 H _2 O ( l ) \quad E ^{\circ}=1.67 V$, At $\left[ Fe ^{2+}\right]=10^{-3} M , P \left( O _2\right)=0.1$ atm and $pH =3$, the cell potential at $25^{\circ} C$ is

$(I)$ Strong field ligand $(II)$ Weak field ligand
$(III)$ Mixed field ligand $(IV)$ Chelated ligand field
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