on Solvent front A ternary mixture of the following three compounds (P, Q, and R

Question

on Solvent front A ternary mixture of the following three compounds (P, Q, and R) was subjected to three separate thin layer chromatographic analysis using different eluant systems. The three eluant system used for RUN-1 was 100% hexanes, for RUN 2 was 70% hexanes and 30% dichloromethane, and for RUN-3 was 100% acetone. The diagrams A-E are sketches of developed TLC plates with the three spots identified by their letters. Which TLC sketch best describes the results of RUN 1? which TLC sketch best describes the results of RUN 2? which TLC sketch best describes the results of RUN 3?

Explanation / Answer

Run1 --> 100% hexane, will carry only nonpolar molecules, that is R > Q > P

so choose "A" since R will go far away

Run2 --> 70% hexane and 30%dichloro... this will carry mostly R > Q > P again, but longer retentions

Choose "C"

so

Run3 --> Acetone is polar, will NOT carry R, but will P> R; so best figure ir "E"

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