Anhydrous AlCl3\text { Anhydrous } \mathrm{AlCl}_{3} Anhydrous AlCl3
SO3\mathrm{SO}_{3}SO3
Anhydrous FeCl3\text { Anhydrous } \mathrm{FeCl}_{3} Anhydrous FeCl3
Anhydrous BrCl3\text { Anhydrous } \mathrm{BrCl}_{3} Anhydrous BrCl3