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separation inquiry

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tashkent:
Greetings everyone!

I have a question regarding the separation of toluene, aniline and benzoic acid which I encountered in the GRE Chemistry exam.  What separation technique will be the best way to isolate these compounds?  Choices are" GC-MS, anion exchange resin, cation exchange resin, and 2 qualitative chemical tests which I already forgot.  My friend says that they can be differentiated through qualitative chemical tests.  Is he correct?

Hope to receive replies from u guys.  Thanks so much.

Regards,
Tashkent

Mitch:
GC-MS

You would use cation exchange to seperate cations & anion exchange to seperate anions. Because you have a mixture of anion, cation (aniline) and a neutral toluene the best choice is GC-MS.

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