Question

Help with the chem question in the picture, 11-15.

230 C at 16 mmHg) at atmospheric pressure 11. A mixture of compounds A and B was run on TLC using 10% ethyl ac- etate/90% hexanes, and the R, values of 0.05 and 0.12 were obtained. Is this optimal? How can the separation be improved? 12. A mixture ofphenol and cyclohexanol is run on a TLC plate using 30% ethyl sing a UV lamp. Does this mean acetate/70% hexanes. Only one spot is seen u that both compounds have the same R? How can the problem be solved? 13. Assume that compounds A and B have R, values of 0.3 and 0.5, respectively. How far will each of these compounds travel if the solvent front reaches 8 cm? 14. A mixture of p-methylstyrene, p-methoxystyrene and p-cresol (p-methylphe- nol) is run, and the following spots are obtained 0 Solvent front Calculate the R, values and match the three compounds to the three spots. 15. In which order would the following compounds elute on a silica gel column using hexanes/ethyl acetate as eluent? CH3 он COOH OH

Answer 1

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