Final answer:
OF2 violates the octet rule because the oxygen atom has 10 valence electrons, which is more than the stable configuration of eight valence electrons.
Step-by-step explanation:
The compound or ion that violates the octet rule is (d) OF2. The octet rule states that atoms in a molecule will gain, lose, or share electrons to achieve a stable electron configuration with eight valence electrons. In OF2, the oxygen atom has three lone pairs of electrons and is bonded to one fluorine atom, resulting in a total of 10 electrons around the oxygen atom. This violates the octet rule.