Fehling's solution can detect presence of

Options

A. Sucrose
B. Glucose
C. Amino acids
D. Lipids

Answer

To determine the presence of a specific substance using Fehling's solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fehling's Solution**:
- Fehling's solution is a chemical reagent used to test for the presence of reducing sugars. It is a mixture of copper(II) sulfate (CuSO₄) and sodium potassium tartrate.

**Hint**: Remember that Fehling's solution is specifically used for detecting reducing sugars.

2. **Identifying Reducing and Non-Reducing Sugars**:
- Reducing sugars are those that have a free aldehyde or ketone group, allowing them to reduce copper ions in Fehling's solution. Common examples include glucose and fructose.
- Non-reducing sugars, like sucrose, do not have a free aldehyde or ketone group and therefore do not react with Fehling's solution.

**Hint**: Distinguish between reducing sugars (which react) and non-reducing sugars (which do not react).

3. **Performing the Test**:
- When Fehling's solution is added to a sample containing a reducing sugar, the solution will change color. It will turn from blue to red due to the formation of red precipitate (copper(I) oxide, Cu₂O).
- If a non-reducing sugar is present, the color will remain blue, indicating no reaction.

**Hint**: A color change to red indicates the presence of a reducing sugar.

4. **Analyzing the Options**:
- **Sucrose**: A disaccharide and a non-reducing sugar. It will not react with Fehling's solution, so no color change will occur.
- **Glucose**: A monosaccharide and a reducing sugar. It will react with Fehling's solution and produce a red precipitate.
- **Amino Acids**: Generally do not react with Fehling's solution.
- **Lipids**: Also do not react with Fehling's solution.

**Hint**: Focus on the type of sugar in the options to determine which can be detected by Fehling's solution.

5. **Conclusion**:
- Based on the analysis, glucose is the only substance from the options provided that can be detected using Fehling's solution.

**Final Answer**: Fehling's solution can detect the presence of **glucose**.