O3 molecule is bent
ONF is isoelectronic with O2N⁻
OF2 is an oxide of fluorine
Cl2O7 is an anhydride of perchloric acid
An oxide is a compound in which oxygen has a charge of -2. In OF2, since fluorine is more electronegative than oxygen, so oxygen has a formal charge of +2. Hence, OF2 is not considered an oxide. Hence, option C is correct.