A thin-layer chromatography (TLC) plate coated with silica gel is developed using…

CHEMISTRY · Single correct · A Level · Chemistry · Chromatography · Chromatography

Problem

A thin-layer chromatography (TLC) plate coated with silica gel is developed using 90:10 hexane:ethyl acetate as the mobile phase. A mixture contains benzoic acid, benzaldehyde, and ethylbenzene. Which order of increasing Rf values is most consistent with the polarities of these compounds under the stated conditions? (a) benzaldehyde<benzoic acid<ethylbenzene\text{benzaldehyde} < \text{benzoic acid} < \text{ethylbenzene} (b) ethylbenzene<benzaldehyde<benzoic acid\text{ethylbenzene} < \text{benzaldehyde} < \text{benzoic acid} (c) benzoic acid<benzaldehyde<ethylbenzene\text{benzoic acid} < \text{benzaldehyde} < \text{ethylbenzene} (d) benzoic acid<ethylbenzene<benzaldehyde\text{benzoic acid} < \text{ethylbenzene} < \text{benzaldehyde}

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