Which of the following molecules will have the highest rf value when studied with thin-layer chromatography using a silica plate?
a. ch3ch2ch2ch2ch3
b. hoch2ch2ch2ch3
c. hoch2ch2ch2oh
d. hoocch2ch2ch3

A. CH3CH2CH2CH2CH3

Explanation:

The silica in the plate is polar and contains hydroxil groups in its surface.

Compound B, C, are polar containing hydroxyl gropus and compound D is a carboxylic acid which is polar. It follows then that these compounds will be retained more strongly than the non polar hydrocarbon compound CH3CH2CH2CH2CH3.

Since the retention factor, Rf, is defined as the distance travelled by the solute divided by the distance travelled by the solvent, we can deduce that compound A. CH3CH2CH2CH2CH3 will travel farthest and have the highest Rf.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

the answer is d.) potassium