Arrange the following compounds in the strictly decreasing order of their percentage enol content at — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

The enol form of phenol (III) is ~100% because it generates a highly stable $6\pi$ aromatic ring. Acetylacetone (II) is a $\beta$-diketone with exceptionally high enol content (~76%) due to internal H-bonding and extended conjugation. Acetone (I) is a simple mono-ketone where the keto form is vastly more stable. Thus, III > II > I.