which compound is an exception to the octet rule?\no h₂o\no hcl\no ccl₄\no clf₃

Brief Explanations:

The octet rule states that atoms tend to gain, lose, or share electrons to have eight electrons in their outer - shell. In $H_2O$, $HCl$, and $CCl_4$, the atoms follow the octet rule. In $ClF_3$, the central chlorine atom has more than 8 electrons (10 electrons in its outer - shell) due to the presence of 3 bonding pairs and 2 lone pairs, making it an exception to the octet rule.

Answer:

D. $ClF_3$