Solve the questions below Draw the structures of benzoic acid and biphenyl Benzo

Question

Solve the questions below

Draw the structures of benzoic acid and biphenyl Benzoic Acid Structure: Biphenyl Structure: Which compound is more polar? Explain Which compound would you expect to interact more with the polar stationary phase? Hexane (Hex) and ethyl acetate (EtQAc) are two common solvents that are used to separate molecules on TLC plates. Draw these molecules and circle which molecule is more polar. Identify which of these TLC solvent systems is most polar and explain why. 1:1 (v:v) Hex : EtQAC 3:1(v:v)Hex:EtOAc 1:3 (v:v) Hex : EtOAC Explain why a mixture of compounds might separate on a TLC plate.

Explanation / Answer

a) benzoic acid is more polar

b) benzoic acid is expected to react moe with polar stationary phase

2) ethyl acetate is polar , hexane is non polar

3) c option 1:3 hex: EtOAC is most polar

4) since different compounds have different binding abilities , a polar molecule like benzoic acid gets easliy absorbed to polar ETOAc while non polar Biphenyl compound doesnot gets adsorbed and move farther in TLC .

hexane - CH3-CH2-CH2-CH2-CH2-CH3 , ETOAc- CH3-COO-CH2-CH3

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