Two compounds $I$ and $II$ are eluted by column chromatography (adsorption of $I > II$). Which one of the following is a correct statement?

  • A
    $II$ moves slower and has higher $R_f$ value than $I$
  • B
    $II$ moves faster and has higher $R_f$ value than $I$
  • C
    $I$ moves faster and has higher $R_f$ value than $II$
  • D
    $I$ moves slower and has higher $R_f$ value than $II$

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