Carbohydrates can be tested by using which of the following?

Options

A. Iodine
B. Caustic soda
C. Copper sulphate
D. Fehling's solution

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the substances that can be used to test for the presence of carbohydrates.

2. **Identifying Testing Agents**: The options given are:
- Iodine
- Caustic soda
- Copper sulfate
- Fehling's solution

3. **Selecting the Correct Testing Agent**: Among these options, Fehling's solution is specifically used to test for reducing sugars, which are a type of carbohydrate.

4. **Procedure for Testing**:
- Take the sample solution that you want to test for carbohydrates.
- Add Fehling's solution A and Fehling's solution B to the sample.
- Place the mixture in boiling water for about 10 minutes.

5. **Interpreting the Results**:
- After boiling, observe the solution.
- If a red precipitate forms, it indicates the presence of carbohydrates (specifically reducing sugars).
- If no red precipitate forms, it suggests that carbohydrates are not present in the sample.

6. **Conclusion**: Therefore, carbohydrates can be tested using Fehling's solution.

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