[Metallic Scalpel]

Why is -OH more polar than a ketone. I had a question that said that the Rf value would be lower for compound that has an -OH group than the ketone. I don't understand why -OH is more polar. Doesn't ketone have a larger dipole moment and that would make it more polar?

[TwistedConf]

What does the surface of your stationary phase look like?  What kind of interactions other than generic dipole-dipole forces are possible (or not)?

[PhDoc]

Believe it or not, this is actually an old conversation based upon the importance of dipole moment in TLC. You may fair well to search this via Google.