Which of the following statements is not correct?

Question

$\begin{array}{1 1}\text{Binary compounds of fluorine and oxygen are known as oxygen fluorides and not fluorine oxides}\\\text{For a metal exhibiting more than one oxidation state,the halides in the lower oxidation state is more covalent than the one in the higher state}\\\text{Halogens do not occur freely in nature}\\\text{Most of binary compounds between oxygen and halogens are unstable}\end{array}$