The matching of the reagents with macromolecules are;
1. Benedict's - Reduced Sugars
2. Iodine - Starch
3. Biuret - Protein
1) Benedicts Reagent is sometimes used in place of Fehling's solution to detect the presence of reducing sugars.
2) Iodine Reagent; This is used to detect starch when it reacts with it.
3) Biuret Reagent; This is used to detect the presence of peptide bonds which in this case is protein.
The complete question is;
Match each reagent with type of macromolecule that it can be used to detect:
A: Reagents
1. Benedict's
2. Iodine
3. Biuret
B: Macromolecule
1. Starch
2. Protein
3. Reduced Sugar
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