Retardation (retention) factor (R_f) of four components A, B, C and D in thin layer chromatography (TLC) were found out be 0.9, 0.3, 0.6 and 0.5 respectively. The correct increasing order of their degree of adsorption on the glass plate is

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B, D, C, A

B, C, D, A

A, C, D, B

A, D, B, C

answer is C.

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Detailed Solution

TLC is an example of ascending chromatography. Most adsorbed component will have least value of R_f.

$R_{f} = \frac{Distance travelled by component}{Distance travelled by solvent}$

$∴$ The component which is least adsorbed will have higher value of R_f.

R_f …. A > C > D > B

Degree of adsorption : A < C < D < B

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