Question:

Given below are two statements :

Statement I : Retardation factor (Rf) can be measured in meter/centimeter.

Statement II : Rf value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below :

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\(R_f\) is a ratio of two distances, so it is dimensionless; it also depends on the solvent system.
Updated On: Nov 4, 2026
  • Statement I is true but statement II is false
  • Statement I is false but statement II is true
  • Both statement I and statement II are true
  • Both statement I and statement II are false
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The Correct Option is D

Solution and Explanation

\(R_f = \dfrac{\text{distance moved by the compound}}{\text{distance moved by the solvent front}}\), a ratio of two lengths, hence a pure number with no unit.
Statement I (can be measured in m/cm) is therefore false.
The \(R_f\) value depends on the nature of the solvent (polarity), the adsorbent and temperature, so it is different in different solvents. Statement II is false.
Answer: (4) Both statement I and statement II are false
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