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2. Ninhydrin is the hydrate of a triketone and is in equilibrium with it.In the following statements which one is TRUE? (A) Ninhydrin is a good reagent for testing α-amino acids, usually carried out at acidic condition. (B) The positive ninhydrin test usually exhibits an intense purple color. (C) Ninhydrin is a good reagent for testing nucleosides, usually carried out at basic condition. (D) The positive ninhydrin test usually exhibits a red color. (E) The positive ninhydrin test usually exhibits a green color.

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