Verified Solution • 2025–26 Session moderate

QJEEM23Che544: JEE Main 2023 Chemistry - Class 11 JEEM23Che544 Solution: Using column chromatography, mixture of two compounds 'A' and…

Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has

Multiple Choice Options

  • A high Rf, weaker adsorption
  • B high Rf, stronger adsorption
  • C low Rf, weaker adsorption
  • D low Rf, stronger adsorption

Step-by-Step Verified Solution

In column chromatography, the compound that elutes first is the one that is less strongly adsorbed to the stationary phase. Hence, 'A' has weaker adsorption than 'B'. Therefore, 'B' has stronger adsorption.

The retention factor (Rf) is a measure of how much a compound moves up the column; a higher Rf means the compound travels further and is less strongly adsorbed to the stationary phase. Since 'A' elutes first, 'A' has a higher Rf than 'B'. Hence, 'B' has a lower Rf.

So, the correct answer is 'Option D: low Rf, stronger adsorption'.

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