- A$\begin{array}{l}CHCl\\{\rm{||}}\\CHAsC{l_3}\end{array}$
- B$\begin{array}{l}CHC{l_2}\\{\rm{|}}\\CHAsC{l_3}\end{array}$
- ✓$\begin{array}{l}CHCl\\||\\CHAsC{l_2}\end{array}$
- DNone of these
$\begin{array}{*{20}{c}}
{CH} \\
{|||\,\,\,\,} \\
{CH}
\end{array} + \mathop {\begin{array}{*{20}{c}}
{Cl\,\,\,\,} \\
{|\,\,\,\,\,\,\,} \\
{AsC{l_2}}
\end{array}}\limits_{{\text{Arsenic}}{\mkern 1mu} {\mkern 1mu} {\text{trichloride}}} \xrightarrow{{Anhydrous\,AlC{l_3}}}\mathop {\begin{array}{*{20}{c}}
{\,\,\,\,CHCl\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{CH\,\,AsC{l_2}}
\end{array}}\limits_{{\text{Lewisite }}\left( {\beta {\text{ - Chlorovinyl }}{\mkern 1mu} {\mkern 1mu} {\text{dichloroarsine}}} \right)} $
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$(I)$ $\begin{array}{*{20}{c}} {C{H_3}\,\,\,\,\,\,Br} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,} \\ {C{H_3} - CH - CH - C{H_3}} \end{array}$
$(II)$ $[Figure\,2]$
$(III)$ $\begin{array}{*{20}{c}} {{C_6}{H_5} - CH - {C_6}{H_5}} \\ {|\,\,\,} \\ {Br} \end{array}$
$(IV)$ $[Figure\,4]$
Which one of the following is correct sequence of the halides given above in the decreasing order of their reactivity ?