The species that exhibits the highest R_f val | vedclass

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(A) In thin layer chromatography $(TLC)$,the stationary phase (silica gel) is polar in nature.The $R_f$ value is inversely proportional to the polarit

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Propylbenzene

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(A) In thin layer chromatography $(TLC)$,the stationary phase (silica gel) is polar in nature.The $R_f$ value is inversely proportional to the polarity of the compound.Non-polar compounds interact less with the polar stationary phase and move faster with the non-polar solvent,resulting in a higher $R_f$ value.Comparing the polarities:$1$. $N$-methylpyridinium ion is an ionic species,making it the most polar.$2$. Phenol has an $-OH$ group,allowing for hydrogen bonding,making it polar.$3$. Pyridine is polar due to the lone pair on nitrogen.$4$. Propylbenzene is a hydrocarbon and is the least polar among the given options.Therefore,propylbenzene will have the highest $R_f$ value.

The species that exhibits the highest $R_f$ value in a thin layer chromatogram using a non-polar solvent on a silica gel plate is

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