Which of the following are exceptions to the Lewis octet rule?

(I) BF₃ (II) H₂CO (III) XeF₄ (IV) H₃O⁺ (V) ClF₃

Question

Which of the following are exceptions to the Lewis octet rule? (I) BF₃ (II) H₂CO (III) XeF₄ (IV) H₃O⁺ (V) ClF₃

Quizplus · Accepted Answer

The exceptions to the Lewis octet rule include molecules or ions where atoms have less than or more than eight electrons in their valence shell. (I) BF3, (III) XeF4, and (V) ClF3 are examples where the central atom does not follow the octet rule. BF3 has an incomplete octet around the boron atom, XeF4 involves xenon with more than eight electrons (an expanded octet), and ClF3 also involves an expanded octet around the chlorine atom.

Which of the Following Are Exceptions to the Lewis Octet