The Purple Color of the Anion Formed in the Ninhydrin

question 59

Multiple Choice

The purple color of the anion formed in the ninhydrin test for α-amino acids is due to:

• A)the attraction of the anion to a metal in a pi-complex.
• B)intermolecular hydrogen bonding.
• C)molecular vibrations.
• D)the highly conjugated nature of the anion.
• E)the color of the ninhydrin.

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