In the colorimetric chemical method, LB yields which color product?

• A. Pink
• B. Green Monosulfonic Acid
• C. Blue
• D. Yellow

Answer: (B)

In colorimetric methods, the detected signal comes from a reaction that forms a colored chromogen; the color you observe reflects the specific chemical structure of that product. For this LB-based reaction, the analyte is converted into a monosulfonic acid derivative that has a green chromophore, so the color produced is Green Monosulfonic Acid. The other colors would correspond to different chromophores that don’t form in this particular reaction under these conditions.