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A) The basicity reduction from the introduction of the dipoles reflects the preferred conformation of the side chains. The positive end of the ammonium dipole is on the hydrogen atoms attached to the nitrogen. The nitrogen atom is the negative end. B) The acidity of the carboxylic group depends on the relative orientation of the substituent dipole with respect to the charged carboxylate. Only the s-cis rotamer data is shown. The error is ±0.05.
