Retardation factor is the ratio of ____________
(a) Distance moved by substance from base line to distance moved by the solvent from base line
(b) Distance moved by solvent from base line to distance moved by the substance from base line
(c) Distance moved by substance from top line to distance moved by the solvent from top line
(d) Distance moved by solvent from top line to distance moved by the substance from top line
The question was posed to me in an internship interview.
Asked question is from Thin Layer Chromatography topic in chapter Methods of Purification of Engineering Chemistry I