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When trying to purify fluorene, why does a NaOH extraction work best with Benzoic Acid, succinimide,...

When trying to purify fluorene, why does a NaOH extraction work best with Benzoic Acid, succinimide, and fluorenone but a HCl extraction works best with ethyl-4-aminobenzoate? Also, draw the acid/base reaction for each of the reactions.

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