3. Which of the following local anesthetics is most potent, least stabile, and most allergenic?

Answer:  Tetracaine

The least stable and allergenic local anesthetics are the ester amides.  All of the local anesthetics shown here are amides except tetracaine, which is an ester.  Therefore tetracaine is the answer.  Also, tetracaine is the most potent of all the local anesthetics listed.

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