p -Block elements - ll — Chemistry STD 12 Science — Question

$\begin{array}{l}
Mg(s) + 2A{g^ + } \to M{g^{ + 2}} + 2Ag(s)\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{(0}}{\rm{.0001M) (0}}{\rm{.100M)}}
\end{array}$

If $E_{cell}^o = 3.17\,V$

$R - Br + C{l^ - }\xrightarrow{{DMF}}R - Cl + B{r^ - }$  ,

which one of the following undergoes complete inversion of configuration?

$\begin{align}
   \begin{matrix}
   C{{H}_{3}}-CH-C{{O}_{2}}H  \\
   |\,\,\,\,\,\,\,\,  \\
   \underset{\oplus }{\mathop{N}}{{H}_{3}}  \\
\end{matrix}\,\,\,\,\,\,p{{K}_{a}}=2.2 \\ 
  \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,p{{K}_{b}}=4.4 \\ 
\end{align}$

            $(I) $                                     $(II)$                        $(III)$
Correct order of their basic strength is :