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Q.
In chromatography, which of the following statements is incorrect for $R_{f}$ ?
Organic Chemistry – Some Basic Principles and Techniques
Solution:
In chromatography, the expression of retention factor $\left(R_{f}\right)$ is
$R_{f}=\frac{\text { Distance travelled by the compound from origin }}{\text { Distance travelled by the solvent from origin }}<1$
The value of $R_{f}$ signifies the relative ratio of migration of each component of the mixture with respect to the developing solvent used. $R_{f}$ value depends on the type of adsorption chromatography like TLC (Thin-Layer Chromatography), paper chromatography etc. The $R_{f}$ value is also the characteristic of a compound (sample) for a given developing solvent at a given temperature.
When the compound in the sample (usually less polar) is weakly adsorbed the spot will travel a shorter distance from the origin and hence the $R_{f}$ value will be decreased.