A) Reducing sugar
B) Starch
C) Protein
D) Cupric ion
Correct Answer: C
Solution :
Ninhydrin is often used to detect \[\text{ }\!\!\alpha\!\!\text{ -}\]Amino acids and also free amino and carboxylic acid groups on proteins and peptides. Ninhydrin produce blue or purple pigment, sometimes called Ruhemann's purple.
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