Is it true that the oxidizing properties of fluorine are more pronounced than that of chlorine?

As for fluorine, it really is! From a theoretical point of view, if you take the table of electronegativities of the elements of the periodic table, fluorine is the most powerful oxidizing agent. Its electronegativity is 4, which is the largest value in the entire table.
But in practice, its properties are slightly different. If we compare the strengths of the acids HCl and HF, then in theory the hydrogen fluoride will be stronger, although in practice, due to the strong electrodynamic attraction, the fluoric acid molecules are attracted and exist in the form of dimers, which slightly reduces the reactivity of the acid. Therefore, fluorine is indeed the strongest oxidizing agent!