試題詳解

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.