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This question was intresting , In column chromotogrphy normal pahse we use mobile phase as non-polar solvent ,stationary pahse as polar .
9-fluorenone eluted last because it is more polar and has a higher afinity for stationary phase.
normal phase stationary phase is polar so compound having high afinity towrds stationary phase.
Same compound in reverse phase we will get answer like this,
9-fluorenone eluted first because it is more polar and has a less afinity for stationary phase.
In two cases polarity remain unchanged. See this compound structure it have carobnyl group it is polar part of this compound .so we wil get answer like this.
Reverse phase column stationary phase is nonpolar matreial .mobile pahse polar .so compound elute first.
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steps/procedures includes for reference)
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