Chemistry - Complete d-block Question with Solution | TestHub

The correct option is (C) High bond enthalpy due to covalent character. According to NCERT guidelines, fluorine stabilizes high oxidation states in two distinct ways, depending on the type of compound.

For ionic compounds like $Co{F}_3$, the stability is driven by higher lattice energy.

For higher oxidation state covalent compounds like $V{F}_5$ and $Cr{F}_6$, the stability is due to higher bond enthalpy terms. Due to fluorine's small size and high electronegativity, it forms exceptionally strong covalent bonds with transition metals in their maximum oxidation states.