Extraction Orgo!

[SaintJude]

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edit: nevermind--i just read pfaction's explanation on a related post. and it cleared it up. benzenes are bases-
Orgo Subject Test Kaplan 3:

Which of the choices below lists a possible sequence via which the three compounds shown, initially in a chloroform solution, may be separated?


A. Extraction with a weakly acidic aqueous solution, followed by extraction with a strongly acidic aqueous solution, followed by distillation.
B. Extraction with a strongly acidic aqueous solution, followed by extraction with a weakly acidic aqueous solution, followed by distillation.
C. Extraction with a strongly acidic aqueous solution, followed by extraction with an even stronger acidic aqueous solution, followed by distillation.
D. Extraction with a strongly basic aqueous solution, followed by extraction with a weakly acidic aqueous solution, followed by distillation.

Can someone explain?

Answer is : A

 

[MedPR]

It actually doesn't matter if benzene is a base or an acid. In extractions, you always do weak acid/base before strong acid/base. All answers but A start out with a strong acid or strong base, making them automatically wrong.

 

[SaintJude]

It actually doesn't matter if benzene is a base or an acid. In extractions, you always do weak acid/base before strong acid/base. All answers but A start out with a strong acid or strong base, making them automatically wrong.

Mhhhm, thank you. Actually I never "actively" noticed that trend (starting with weak acid/base). If extractions come up this may certainly help in POE.