Which is the more stable form of acetophenone?

Question

Quizplus · Accepted Answer

In form II, there is intramolecular hydrogen bonding between the carbonyl oxygen and the ortho hydrogen of the phenyl group, which stabilizes the molecule through resonance. This extra stabilization makes form II more stable than form I. Form III is less stable than form I because the carbonyl group is directly attached to an electron-withdrawing group (fluorine), which decreases the electron density of the carbonyl carbon and makes it less stable.

Which Is the More Stable Form of Acetophenone