Hi, my teacher said something about this that I did not agree with. When adding any acid, HX, to an alkene, Markovnikov's rule applies. The except to this is HBr. If HBr is added, anti-Mark's applies. My teacher told me anti Mark's rule applies only in the presence of Sulfuric Acid as a catalyst. I search on multiple websites and asked my tutor. H2SO4 is never mention as a catalyst.
Is this true? ( Does anti-Mark's rule apply only if HBr is in the presence of Sulfuric Acid?
Is H2SO4 needed as a catalyst for all Mark rule applications?
Thanks in advance.