Final answer:
The molecule IF3 contains an atom that does not obey the octet rule because iodine can expand its octet due to being in period 5 of the periodic table. B is the cortrect .
Step-by-step explanation:
The molecule that contains an atom that does not obey the octet rule among the options provided is IF3.
The octet rule states that atoms tend to bond in such a way that they have eight electrons in their valence shell, giving them the same electronic configuration as a noble gas. However, there are exceptions to this rule.
For example, iodine in IF3 can have more than eight electrons in its valence shell because it can expand its octet as it is in the period 5 of the periodic table, which allows for d-orbital participation. Hence, IF3 is the mentioned correct option in the final answer.