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organic chemistry

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urgent, please help me...this is about the separation and purification scheme...
there is 4 group of mixture:
a)benzoic acid, benzoin and 1,4-dibromobenzene
b)fluorene, o-toluic acid and 1,4-dibromobenzene
c)phenanthrene, methyl 4-aminobenzoate and 1,4-dibromobenzene
d)4-aminoacetophenone, 1,2,4,5-tetrachlorobenzene and 1,4-dibromobenzene

how should I isolate the mixture? I need to isolate 2 out of 3 compound from the mixture...
can somebody help me please?

  • organic chemistry -

    I can help you with the first one only

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