With respect to halogens, four statements are given below.
(I) The bond dissociation energies for halogens are in the order $$\text{I}_2 < \text{F}_2 < \text{Br}_2 < \text{Cl}_2$$
(II) The only oxidation state is $$-1$$
(III) The amount of energy required for the excitation of electrons to first excited state decreases progressively as we move from F to I
(IV) They form $$\text{HX}_2^-$$ species in their aqueous solutions (X = halogen).
The correct statements are