Which of the following statements are correct with respect to benzene?
$(i)$ It forms triozonide with $O_3$.
$(ii)$ It is non-planar.
$(iii)$ It forms only one monosubstituted product with $CH_3COCl$ in the presence of anhydrous $AlCl_3$.
$(iv)$ It forms hexachlorobenzene on heating with $Cl_2$ under photochemical conditions.

• A
  $(i)$,$(ii)$
• B
  $(ii)$,$(iii)$
• C
  $(i)$,$(iii)$
• D
  $(iii)$,$(iv)$