What is the hybridization state of the oxygen atom in the following compound?

Question

Quizplus · Accepted Answer

The oxygen atom in the compound is bonded to two carbon atoms and a hydrogen atom. To determine the hybridization state of the oxygen atom, we count the number of sigma bonds and lone pairs on the oxygen atom. In this case, the oxygen atom has two sigma bonds and two lone pairs. This corresponds to an sp3 hybridization state. However, since one of the lone pairs is involved in resonance with the adjacent carbon-carbon double bond, we must consider the effective hybridization state to be sp2. Since none of the answer choices include sp2, we choose the closest option, which is sp³.

What Is the Hybridization State of the Oxygen Atom in the Following