Question

Given below are two statements:

Statement I : Retardation factor (RF) can be measured in metre/centimetre
Statement II : Rf avalue of a compound remains constant in all solvents.
Choose the most appropriate answer from the options given below:

• A. Statement I is false but statement II is true
• B. Both statement I and statement II are false
• C. Both statement I and statement II are true
• D. Statement I is true but statement II is false

Answer 1

The correct option is B Both statement I and statement II are false

In thin-layer chromatography, the retention factor (Rf) is used to compare and help identify compounds. The Rf value of a compound is equal to the distance traveled by the compound divided by the distance traveled by the solvent front (both measured from the origin).
Thus, Rf (Retardation factor) is dimensionless.
Rf value will be different for same compounds at different solvent because it depends on the solubility and polarity with solvent.
Hence, both statements are wrong.