Incorrect statement in the following is
Boron compounds behave as Lewis acids because of their Electron deficient character
SO2 acts as both lewis acid and lewis base
BF3 is a Lewis acid but is not a Bronsted acid
In water among HClO4, HCl, HBr the strongest acid is HClO4
No acid stronger than H+ or H3O+ or H5O2+ etc can exist in water. This is called levelling effect of water.