Discuss the role of Lewiis acids in the preparation of aryl bromides and chlorides in the dark.

Explanation

The role o Lewis acids in the preparation of aryl chloridees and bromides is to generate the electrophiles, i.e., `Cl^(+)` and `Br^(+)` from the corresponding halogens.

These electrophiles then react with arenes to form the corresponding aryl halides by electrophilic substitution mechanism.