MCQ
Which one of the following has the maximum acid strength
- ✓$o-$ nitrobenzoic acid
- B$m-$ nitrobenzoic acid
- C$p-$ nitrobenzoic acid
- D$p-$ nitrophenol

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$\begin{align}
\begin{matrix}
C{{H}_{3}}-CH-C{{O}_{2}}H \\
|\,\,\,\,\,\,\,\, \\
\underset{\oplus }{\mathop{N}}{{H}_{3}} \\
\end{matrix}\,\,\,\,\,\,p{{K}_{a}}=2.2 \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,p{{K}_{b}}=4.4 \\
\end{align}$
$Fe|F{e^{ + 2}}\left( {0.2\,M} \right)||A{u^{ + 3}}\left( {0.02\,M} \right)|Au$, If $E_{F{e^{ + 2}}/Fe}^o = - 0.44\,V$ and $E_{Au/A{u^{ + 3}}}^o = - 1.50\,V$
The end product in the above sequence is :