As the oxidation number of the central atom increases, strength of acid also increases. HOCl<HOClO<HOClO2<HOClO3 Related Theory The chlorine is more electronegative than bromine. As a result, it will attract electrons more towards itself than bromine. This will result in a donation of H+ more easily in HOCl than in HOBr. So, the HOCl will be stronger acid than HOBr.