JEE Main Chemistry question
Statement 1: Glycine exists as a Zwitter ion but o- and p-aminobenzoic acid do not. Statement 2: Due to the presence of and groups within the same molecule, they neutralise each other, and hence α-amino acids exist as dipolar ions or Zwitter ions.
Answer: (B)
Solution
Statement 1 is true: in o- and p-aminobenzoic acid, the amino group's lone pair is delocalised into the aromatic ring, weakening its basicity so much that the weakly acidic –COOH group cannot protonate it, so no stable zwitterion forms, unlike in aliphatic glycine. Statement 2 correctly explains why ordinary aliphatic
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