Two silica-gel TLC plates are prepared with identical spots of a mixture containing…

CHEMISTRY · Single correct · A Level · Chemistry · Chromatography · Chromatography

Problem

Two silica-gel TLC plates are prepared with identical spots of a mixture containing ferrocene (non-polar), acetylferrocene (moderately polar), and ferrocene sulfonic acid (ionic). Plate 1 is developed in 100 % hexane, whereas Plate 2 is developed in a 30 % acetone/hexane solvent. Which statement best describes the expected behavior? (a) The

R_{f}

of acetylferrocene decreases on Plate 2, and ferrocene shows the highest

R_{f}

on Plate 2. (b) The

R_{f}

of acetylferrocene increases on Plate 2, and ferrocene sulfonic acid shows the highest

R_{f}

on Plate 2. (c) The

R_{f}

of acetylferrocene increases on Plate 2, and ferrocene shows the highest

R_{f}

on Plate 2. (d) The

R_{f}

of acetylferrocene increases on Plate 2, and acetylferrocene shows the highest

R_{f}

on Plate 2.

Related theory

Van der Waals Forces
Intermolecular Forces

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