Which of the following sets of molecules contains ONLY those species that violate the octet rule?

Step-by-step solution

The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons. Molecules that do not have eight electrons around the central atom violate this rule. In BF₃ , the central boron atom has 3 valence electrons and forms 3 single bonds with fluorine atoms. The total number of electrons around boron is 6 . This is an electron-deficient (hypovalent) molecule and violates the octet rule. In SF₆ , the central sulfur atom has 6 valence electrons and forms 6 single bonds with fluorine a