JEE Main202310 Apr 2023Morning ShiftChemistryGeneral Organic ChemistryActual
Using column chromatography, mixture of two compounds ‘ A ’ and ‘ B ’ was separated. ‘ A ’ eluted first, this indicates ‘ B ’ has
Options
- Alow Rf , stronger adsorption
- Bhigh Rf , weaker adsorption
- Chigh Rf , stronger adsorption
- Dlow Rf , weaker adsorption
Correct answer
A. low Rf , stronger adsorption
Step-by-step solution
In chromatography, the retardation factor ( Rf ) is the fraction of an analyte in the mobile phase of a chromatographic system. In planar chromatography in particular, the retardation factor Rf is defined as the ratio of the distance travelled by the centre of a spot to the distance travelled by the solvent front. The more polar spot travels slower, and the less polar spot travels faster. Rf values, on the other hand, are directly related to the rate of movement. The fastest moving spot has the highest Rf value, le