Full answer with explanation please Consider the structure of the molecules belo
ID: 810409 • Letter: F
Question
Full answer with explanation please Consider the structure of the molecules below: a. Rank them according to expected Rf value (from smallest to largest) observed on a silica TLC plate, developed with a solvent consisting primarily of a low dielectric constant solvent. Explain the basis for your ranking. To do so: Describe the kind of interactions which result in a small Rf value: those which give a large one. Identify functional groups in the molecules being separated which determine the likelihood a solute will adhere to the silica plate . Systematically apply answers lo the first two bullets to explain your ranking.Explanation / Answer
o, the silica gel is polar. Since like is attracted to like, other polar molecules will be attracted to the silica gel.
Compound A in your picture is mostly composed of carbon. It appears that Compound B has one OH group, Compund C has two OH groups, and Compound D has 3 OH groups.
As the number of OH groups increases, the molecule becomes more polar.
The solvent is low in polarity. The least polar compounds will be most attracted to the solvent.
Thus, compound D will be most attracted to the silica gel and have the lowest Rf value, because it does not move up the TLC plate. The Rf values from lowest to highest are D<C<B<A
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