Which of the following would be most reactive towards nitration?

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.

Write the conditions which prove the exceptional stability of benzene.

The product formed in the given reaction is

At what angle are the carbon atoms arranged in a benzene molecule?

Which of the following cation/anion is not aromatic?