What is the first step in the curved arrow mechanism for the chlorination of benzene in the presence of $FeCl_3$?
I.
Benzene + $Cl_2$ + $FeCl_3$ $\rightarrow$ Benzene-Cl + $FeCl_3$ + HCl
II.
Benzene + $Cl-Cl-FeCl_3$ $\rightarrow$
III.
$Cl-Cl + FeCl_3$ $\rightarrow$ $Cl-Cl-FeCl_3$
IV.
Resonance structures involving benzene, $Cl$, and $FeCl_3$
Options:
I
II
III
IV
II or III
