Which of the following compound can be detected by Molisch's test?

Options

A. (a) Nitro compounds
B. (b) Sugars
C. (c) Amines
D. (d) Primary alcohols

Answer

To determine which of the following compounds can be detected by Molisch's test, we need to analyze the options provided:

1. **Understanding Molisch's Test**:
- Molisch's test is a chemical test used to detect the presence of carbohydrates (sugars) in a compound.
- The test involves the reaction of carbohydrates with Molisch's reagent (α-naphthol) in the presence of an acid, leading to the formation of a purple-colored complex.

2. **Analyzing Each Option**:
- **Option A: Nitro Compounds**: Nitro compounds do not contain carbohydrates and will not give a positive result in Molisch's test.
- **Option B: Sugars**: Sugars are carbohydrates. Therefore, they will react with Molisch's reagent and give a positive result, producing a purple color.
- **Option C: Amines**: Amines do not contain carbohydrates and will not give a positive result in Molisch's test.
- **Option D: Primary Alcohols**: Primary alcohols do not contain carbohydrates and will not give a positive result in Molisch's test.

3. **Conclusion**:
- Based on the analysis, the only compound that can be detected by Molisch's test is **Option B: Sugars**.

### Step-by-Step Solution:
1. **Identify the Purpose of Molisch's Test**: Understand that it is used to detect carbohydrates.
2. **Evaluate Each Compound**:
- **Nitro Compounds**: No carbohydrates → Negative result.
- **Sugars**: Carbohydrates present → Positive result.
- **Amines**: No carbohydrates → Negative result.
- **Primary Alcohols**: No carbohydrates → Negative result.
3. **Select the Correct Option**: The only option that gives a positive result is **Option B: Sugars**.