Aryl fluoride may be prepared from arene diazonium chloride using

What type of arenes are obtained when arene diazonium chloride is treated with fluoroboric acid and then heated further?

How can fluorobenzene be prepared in the laboratory?

Identify the reagent used for the replacement of the $-N_2^+Cl^-$ group from benzene diazonium chloride by an iodine atom.

The decomposition of benzene diazonium chloride using $Cu_{2}Cl_{2} / HCl$ to form chlorobenzene is known as:

Aryl chlorides and bromides can be easily prepared by electrophilic substitution of arenes with chlorine and bromine respectively in the presence of Lewis acid catalysts. But why does the preparation of aryl iodides require the presence of an oxidizing agent?