Chemistry Question from JEE Main 2023 · 29 January, Shift 1

Following chromatogram was developed by adsorption of compound A on a $6 \, \text{cm}$ TLC glass plate. The base line is drawn $0.5 \, \text{cm}$ above the bottom edge of the plate, the solvent front stops $0.5 \, \text{cm}$ below the top edge, and the spot of compound A is found $3.5 \, \text{cm}$ above the bottom edge. The retardation factor of the compound A is _____ $\times 10^{-1}$.