Benedict reagent test is conducted to confirm presence of

Options

A. Protein
B. Lipid
C. Starch
D. Reducing sugar.

Answer

**Step-by-Step Solution:**

1. **Understanding Benedict's Reagent**:
- Benedict's reagent is a chemical solution used to test for the presence of reducing sugars. It contains sodium carbonate, sodium citrate, and copper(II) sulfate.

2. **Identifying Reducing Sugars**:
- Reducing sugars are carbohydrates that can donate electrons to other molecules. They typically contain free aldehyde or ketone groups that can participate in redox reactions.

3. **Conducting the Test**:
- When a sample suspected of containing reducing sugars is mixed with Benedict's reagent and heated, a reaction occurs if reducing sugars are present.

4. **Observing Color Change**:
- The initial color of Benedict's reagent is blue due to the copper(II) ions present. If reducing sugars are present, they will reduce the copper(II) ions to copper(I) oxide, which precipitates out of the solution.

5. **Interpreting Results**:
- The formation of a brick-red precipitate indicates a positive result for the presence of reducing sugars. If no color change occurs, it suggests that reducing sugars are absent.

6. **Conclusion**:
- Therefore, the Benedict's reagent test is specifically conducted to confirm the presence of reducing sugars, and it does not give a positive result for proteins, lipids, or starch.

**Final Answer**: The Benedict's reagent test is conducted to confirm the presence of reducing sugars.

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