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Question: Answered & Verified by Expert
Two compounds I and II are eluted by column chromato-graphy(adsorption of I $>$ II). Which one of the following is a correct statement?
ChemistryGeneral Organic ChemistryJEE MainJEE Main 2018 (15 Apr Shift 2 Online)
Options:
  • A
    II moves slower and has higher $\mathrm{R}_{\mathrm{f}}$ value than I
  • B
    II moves faster and has higher $\mathrm{R}_{\mathrm{f}}$ value than I
  • C
    I moves faster and has higher $\mathrm{R}_{\mathrm{f}}$ value than II
  • D
    I moves slower and has higher $\mathrm{R}_{\mathrm{f}}$ value than I
Solution:
1809 Upvotes Verified Answer
The correct answer is:
II moves faster and has higher $\mathrm{R}_{\mathrm{f}}$ value than I
Since, adsorption of I $>$ II, I is firmly attached to column (stationary phase). Hence, it will move slowly and will move little distance. A1so II is loosely attached to column (stationary phase). Hence, it will move faster and will move large distance.

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