$\begin{array}{1 1}(a)\;As I_3 > As Br_3 > As Cl_3&(b)\; As Cl_3 > As Br_3 > As I_3\\(c)\;As I_3 > As Cl_3 > As Br_3&(d)\;As Cl_3 > As I_3 > As Br_3\end{array}$
