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${B^{3 + }}_{(aq.)} + 3{e^ - } \to B(s)$ ; $E = 0.6\ Volt$
Using above information find the ion which will be deposited first at cathode if solution containing $A_{(aq.)}^{2 + }$ & $B_{(aq.)}^{ 3+ }$ is electrolysed
The correct order of their acidity is 
$(I)$ $\begin{matrix}
\begin{matrix}
\,\,\,Br \\
| \\
\end{matrix} \\
Ph-C-Ph \\
| \\
\,\,\,\,\,\,C{{H}_{3}} \\
\end{matrix}$
$(II)$ $\begin{matrix}
Br \\
|\,\,\, \\
Ph-CH-Ph \\
\end{matrix}$
$(III)$ $\begin{matrix}
Ph-CH-C{{H}_{3}} \\
|\,\,\,\,\,\,\, \\
Br\,\,\,\,\,\, \\
\end{matrix}$
$(IV)$ $PhVH_2Br$