Would the separation of the two compounds (bibenzyl & benzhydrol) in this experi

Question

Would the separation of the two compounds (bibenzyl & benzhydrol) in this experiment have been successful if the eluting solvent order had been reversed (ether first, hexanes second)? Explain. During a mixture separation with column chromatography, why must the level of the solvent be kept above the top of the stationary phase once the procedure is started? A chemist found that a mixture of four components (Compounds A-D) could be separated on a silica gel TLC plate using 10% diethyl ether in hexanes as the eluting solvent (see "original mixture" far left plate in the figure below). The mixture was then chromatographed on a silica gel column eluted with this same solvent mixture and 11 fractions of 15 mL each were collected. Thin-layer chromatographic analysis of the various fractions (1-11) under the conditions stated above gave the results shown in the figure below: According to these results which fractions should be combined to give pure samples of A, B, C, and D? Which fractions contain more than one component? Indicate for these 'mixed' fraction numbers what components of the original mixture are present.

Explanation / Answer

1) It will separate the more polar compopund first that is benzohydrol as we are using hexane first which is more polar than diethyl ether.

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