Which of the following Rf values is not possible?

Correct option is D

Explanation:
In chromatography, the Rf (retention factor) value is defined as the ratio of the distance traveled by the compound to the distance traveled by the solvent front. The Rf value can range from 0.0 to 1.0, where:
· An Rf value of 0.0 indicates that the substance did not move from the origin (the starting point), meaning it is highly polar and adheres strongly to the stationary phase.
· An Rf value of 1.0 indicates that the substance moved with the solvent front, meaning it is very non-polar and does not adhere to the stationary phase at all. Values greater than 1.0 are not physically meaningful in this context, as they would imply the substance traveled further than the solvent front, which is impossible. Thus, an Rf value of 2.0 is not possible.
Information Booster:
· Rf values provide insight into the polarity and behavior of substances during chromatography.
· Rf values of 0.0 and 1.0 are commonly encountered in chromatographic analyses.
· The Rf value is influenced by the nature of the stationary phase and the mobile phase.
· The calculation of Rf is crucial for identifying compounds in various types of chromatography, including TLC (Thin Layer Chromatography) and HPLC (High-Performance Liquid Chromatography).
· Understanding Rf values is essential for optimizing separation techniques in laboratory settings.
· Rf values are useful for comparing different compounds in a mixture based on their movement through the chromatographic medium.
Additional Information:
· Option (a): 0.0 is possible; it indicates no movement from the origin.
· Option (b): 0.5 is possible; it suggests moderate movement relative to the solvent front.
· Option (c): 1.0 is possible; it indicates that the substance traveled the same distance as the solvent front.
· Option (d): 2.0 is not possible as it suggests the substance moved beyond the solvent front, which is unattainable in practical chromatography.