Molish test is given by :

Options

A. All carbohydratres
B. Sucrose only
C. Fructose only
D. Glucose only

Answer

To solve the question regarding the Molish test, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Molish Test**:
- The Molish test is a chemical test used to detect the presence of carbohydrates in a given sample.

2. **Identifying the Reagent**:
- The test involves the use of Molish reagent, which is a solution of alpha-naphthol in ethanol.

3. **Adding Sulfuric Acid**:
- After adding the Molish reagent to the sample, concentrated sulfuric acid (H2SO4) is added. This step is crucial as it facilitates the dehydration of carbohydrates.

4. **Chemical Reaction**:
- The sulfuric acid dehydrates the carbohydrate, producing an aldehyde. This aldehyde then reacts with the alpha-naphthol to form a colored compound.

5. **Observation of Results**:
- The key observation in the Molish test is the formation of a violet ring at the interface of the two layers (the sulfuric acid and the carbohydrate solution). This violet ring indicates the presence of carbohydrates.

6. **Conclusion**:
- Since the question asks which compounds give the Molish test, we conclude that the test is positive for all carbohydrates, not just specific ones like sucrose, fructose, or glucose.

7. **Final Answer**:
- Therefore, the correct answer to the question "Molish test is given by:" is **all carbohydrates**.