Which among the following is the correct arrangement of halogens in the increasing order of their oxidizing nature ?

The oxidizing nature of halogens refers to their ability to accept electrons (undergo reduction) and oxidize other substances. In Group 17 of the periodic table, the oxidizing power decreases down the group from Fluorine to Iodine.

• Fluorine (F): It is the most electronegative element and the strongest oxidizing agent. Its small atomic size and high effective nuclear charge allow it to attract electrons very easily.
• Trend: As we move down the group (from Cl to Br to I), the atomic radius increases and the electronegativity decreases. This makes it progressively harder for the atom to attract and gain an electron.

Consequently, the increasing order of oxidizing nature is Iodine (I) < Bromine (Br) < Chlorine (Cl) < Fluorine (F). Thus, Option D is the correct arrangement.