Choose the correct statement.

$\mathrm{Fe}^{3+}$ ion is more stable than $\mathrm{Fe}^{2+}$ ion because

Secondary valences of the following complexes based on their reactions with excess $\mathrm{AgNO}_3$ are

$$ \begin{array}{llc} \hline & \begin{array}{l} \text { Formula of the } \\ \text { complexes } \end{array} & \begin{array}{c} \text { Moles of } \mathrm{AgCl} \text { precipitated } \\ \text { per mole of complex } \end{array} \\ \hline \text { (I) } & \mathrm{CoCl}_3 \cdot 6 \mathrm{H}_2 \mathrm{O} & 3 \\ \hline \text { (II) } & \mathrm{NiCl}_3 \cdot 6 \mathrm{H}_2 \mathrm{O} & 2 \\ \hline \text { (III) } & \mathrm{Co}\left(\mathrm{SO}_4\right) \mathrm{Br} \cdot 5 \mathrm{NH}_3 & 1 \\ \hline \end{array} $$

Assertion (A) In aqueous solution, amino acids exist in dipolar ion form.

Reason (R) Most of the naturally occurring amino acids have $L$-configuration.

The correct option among the following is

$$ \text { Match the following. } $$

$$ \begin{array}{llll} \hline \text { (A) } & \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \xrightarrow{\mathrm{Aq} . \mathrm{KOH}} & \text { I } & \mathrm{S}_{\mathrm{N}} 1 \\ \hline \text { (B) } & \left(\mathrm{CH}_3\right)_3 \mathrm{Cl} \xrightarrow{\mathrm{H}_2 \mathrm{O}} & \text { II } & \mathrm{E} 2 \\ \hline \text { (C) } & \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \xrightarrow{\text { Alc. } \mathrm{KOH}} & \text { III } & \mathrm{E} 1 \\ \hline \text { (D) } & \left(\mathrm{CH}_3\right)_3 \mathrm{COH} \xrightarrow{\mathrm{H}^{+}} & \text {IV } & \mathrm{S}_{\mathrm{N}} 2 \\ \hline \end{array} $$

$$ \text { The correct match is } $$