In chromatography, which of the following statements is incorrect for R f ?

1. Higher ${\mathrm{R}}_{\mathrm{f}}$ value means higher adsorption.
2. The value of ${\mathrm{R}}_{\mathrm{f}}$ cannot be more than one.
3. ${\mathrm{R}}_{\mathrm{f}}$ value depends on the type of chromatography.
4. ${\mathrm{R}}_{\mathrm{f}}$ value of dependent on the mobile phase.

Solution

${\mathrm{R}}_{\mathrm{f}}$ or Retention factor or Retardation factor $=\frac{\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{ }\mathrm{m}\mathrm{o}\mathrm{v}\mathrm{e}\mathrm{d}\mathrm{ }\mathrm{b}\mathrm{y}\mathrm{ }\mathrm{s}\mathrm{p}\mathrm{o}\mathrm{t}}{\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{ }\mathrm{m}\mathrm{o}\mathrm{v}\mathrm{e}\mathrm{d}\mathrm{ }\mathrm{b}\mathrm{y}\mathrm{ }\mathrm{s}\mathrm{o}\mathrm{l}\mathrm{v}\mathrm{e}\mathrm{n}\mathrm{t}}$

For low polarity compounds, lower will be adsorption and the lower the value of adsorption higher will be ${\mathrm{R}}_{\mathrm{f}}$ value

Asked in: JEE Main 2019 (10 Apr Shift 2)

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