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Identifying dipolar ions

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There is a question in my textbook that reads P-amino acid is not a dipolar ion, whereas glycine (aminoacetic acid) is not a dipolar ion- how do you account for this? I understand that there may be some ring stability involved with the amino bezoic acid but I know that if aqueous acid is added than they will both be converted to a dipolar ion or will they? Need help with distiguishing.

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All amino acids are characterised by two important functional groups:the amino group(NH2) and carboxyllic group (COOH). They exhibit a very important phenomenon of dipolarity or ...

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The solution shows how to identify dipolar ions.