What does a larger Rf value indicate?

What does a larger Rf value indicate?

• A. The compound traveled farther and interacted more strongly with the stationary phase
• B. The compound traveled farther but did not interact with the stationary phase
• C. The compound traveled less and interacted more strongly with the stationary phase
• D. The compound traveled farther and interacted less with the stationary phase

Answer: (D)

In TLC, the Rf value reflects how far a compound moves relative to the solvent front. Movement depends on the balance of interactions with the stationary phase (often polar) and the mobile phase (the solvent). A larger Rf means the compound travels farther up the plate, which happens when it interacts less with the stationary phase and/or more with the mobile phase. So the option describing the compound traveling farther and interacting less with the stationary phase is the best. The other ideas imply more interaction with the stationary phase or less movement, which would produce a smaller or similar Rf.

In TLC, the Rf value reflects how far a compound moves relative to the solvent front. Movement depends on the balance of interactions with the stationary phase (often polar) and the mobile phase (the solvent). A larger Rf means the compound travels farther up the plate, which happens when it interacts less with the stationary phase and/or more with the mobile phase. So the option describing the compound traveling farther and interacting less with the stationary phase is the best. The other ideas imply more interaction with the stationary phase or less movement, which would produce a smaller or similar Rf.