Question

consider the two resonance forms of an enolate, and the curved arrow notation showing movement of electrons. predict the approximate contribution of each resonance structure to the overall resonance hybrid as a ratio of i:ii.

Explanation:

Resonance contribution depends on stability. Structure I has negative charge on electronegative O (more stable), Structure II on less electronegative C (less stable). More stable structures contribute more.

Answer:

9:1