4. d and f- block elements — Chemistry STD 12 Science — Question

$(1)$ $C{H_3}C{H_2}C{H_2}Cl + $ $\begin{array}{*{20}{c}}
  {\,\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,C{H_3}} \\ 
  {\,\,\,|} 
\end{array}} \\ 
  {C{H_3} - C - {O^ - }} \\ 
  {\,\,\,|} \\ 
  {\,\,\,\,\,\,\,\,\,\,C{H_3}} 
\end{array}$                      $(2)$  $C{H_3}C{H_2}C{H_2}I + $$\begin{array}{*{20}{c}}
  {\,\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,C{H_3}} \\ 
  {\,\,\,|} 
\end{array}} \\ 
  {C{H_3} - C - {O^ - }} \\ 
  {\,\,\,|} \\ 
  {\,\,\,\,\,\,\,\,\,\,C{H_3}} 
\end{array}$

$(3)$  $\begin{array}{*{20}{c}}
  {{H_3}C - CH - C{H_3}} \\ 
  {|\,\,\,\,} \\ 
  {Br\,\,\,} 
\end{array}$  $+CH_3O^-$                      $(4)$  $\begin{array}{*{20}{c}}
  {{H_3}C - CH - C{H_3}} \\ 
  {|\,\,\,\,} \\ 
  {Br\,\,\,} 
\end{array}$ $+CH_3S^-$

$Cl_2(aq) + H_2S(aq) \to  S(s) + 2H^+(aq) + 2Cl^-(aq)$

The rate equation for this reaction is rate $= k[Cl_2][H_2S]$ Which of these mechanisms is/are consistent with this rate equation ?

$A.\,C{l_2} + {H_2}S \to {H^ + } + C{l^ - } + C{l^ + } + H{S^- }$  (slow)

$C{l^ + } + H{S^ - } \to {H^ + } + C{l^ - } + {S}$   (fast)

$B.\, H_2S  \Leftrightarrow  H^+ + HS^-$   (fast equilibrium)

$Cl_2 + HS^-\to  2Cl^-+ H^+ + S$ (slow)