Which of the following test is used for identifying carbohydrates ?

Options

A. Millon's test
B. Molisch's test
C. Biuret test
D. None of these

Explanation

To identify carbohydrates, we can use the Molish test. Here’s a step-by-step explanation of the process:

### Step-by-Step Solution:

1. **Understanding Carbohydrates**:
- Carbohydrates are organic compounds that include polyhydroxy aldehydes and polyhydroxy ketones. They can also be large polymeric compounds that can be broken down into these simpler forms.

**Hint**: Remember that carbohydrates can be simple sugars (like glucose) or complex forms (like starch).

2. **Identifying the Tests**:
- We need to evaluate the tests mentioned in the question. The Melan's test is primarily used for detecting phenolic compounds in proteins, particularly tyrosine.

**Hint**: Focus on the specific compounds that each test is designed to identify.

3. **Melan's Test**:
- Melan's test involves the use of Millon’s reagent (mercurous and mercuric nitrate in nitric acid) and is used to confirm the presence of proteins, particularly those containing tyrosine. It produces a white precipitate that turns brick red upon heating.

**Hint**: If the test is for proteins, it cannot be the answer for carbohydrates.

4. **Molish Test**:
- The Molish test is specifically for carbohydrates. In this test, concentrated sulfuric acid is used, which converts carbohydrates into furfural or its derivatives. This furfural then reacts with alpha-naphthol to form a violet ring.

**Hint**: Look for color changes in reactions that indicate the presence of carbohydrates.

5. **Conclusion**:
- Since the Molish test is the only test mentioned that is specifically used for identifying carbohydrates, it is the correct answer.

**Final Answer**: The test used for identifying carbohydrates is the **Molish test**.