Use the eluent from test tubes 2 and 3 as well as the known mixture of fluorence

Question

Use the eluent from test tubes 2 and 3 as well as the known mixture of fluorence and fluorence to spot your 4 cm times 10 cm TLC plate. 1. Explain why the fluorene moved trough the column in Part C first and the fluorenone followed? 2. What would be the result of using too much cotton in a too tight plug for Part C? 3. Using a choice of hexane, dichloromethane or acetone, indicate which solvent you would use to separate the following pairs of compounds. a. Acetophenone and 2-phenylethanol b. Bromobenzene and p- xylene c. Salicyclic acid and o-nitrobenzoic acid

Explanation / Answer

1. Compared to fluorenone, fluorene is less polar so it will move through column first,

2. When we fix more cotton in column, its slow down the flow of solvent , so it take more time to seperate the mixture.

3. a. For acetophenone and 2-phenyl ethanol, Hexane-acetone pair is the best preffered

b. Bromobenzene and p-Xylene, Hexane-acetone pair is the best preffered

c.Salicylic acid and o-nitro benzoic acid Hxane-Dichloroethane pair is the best preffered

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