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NEET levelSingle correct optionDifficulty 1 of 3si065

In thin layer chromatography a spot has moved $3.2 cm$ from the baseline while the solvent front has moved $8.0 cm$ . The $R_{f}$ value of the compound is

A0.25
B2.50
C0.40
D4.80

Answer: C

R_{f} =

distance moved by the compound / distance moved by the solvent front

= 3.2/8.0 = 0.40

.

R_{f}

is dimensionless and never greater than 1.

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