Which of the following resonance structures makes the largest contribution to the structure of [H₂CCHO]^-?

Question

Quizplus · Accepted Answer

The double bond between the carbon and oxygen atoms can contribute to resonance, leading to two possible resonance structures. However, in structure 1, the negative charge is on an oxygen atom, which is a more electronegative atom than the carbon atom, meaning the charge is less stable. Structure 2 has the negative charge on a more stable carbon atom. Therefore, structure 2 makes the largest contribution to the overall structure of the molecule.

Which of the Following Resonance Structures Makes the Largest Contribution