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Reaction with Metals

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Question

Using the provided information in the following paper chromatogram:
The $R_{f}$ value of $A$ is ______ $\times 10^{- 1}$ .

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Solution

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

$Distance travelled by compound A = 2 c m$

$Distance travelled by solvent = 5 c m$

$R_{f (A)} = \frac{2}{5} = 0.4 = 4 \times 10^{- 1}$

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