Which one of the following gives positive Fehling's solution test?

Options

A. Sucrose
B. Glucose
C. Fats
D. Proteins

Explanation

To determine which of the given options gives a positive Fehling's solution test, we can follow these steps:

### Step 1: Understand Fehling's Test
Fehling's test is a chemical test used to differentiate between aldehydes and ketones. It is particularly used to identify reducing sugars. The test involves the reaction of the compound with Fehling's solution, which contains copper(II) ions.

### Step 2: Identify the Options
The options provided are:
1. Sucrose
2. Glucose
3. Fats
4. Proteins

### Step 3: Analyze Each Option
- **Fats**: Fats are composed of long-chain fatty acids and glycerol. They do not contain aldehyde or ketone functional groups, so they will not give a positive Fehling's test.

- **Proteins**: Proteins are made up of amino acids, which contain amine groups. They also do not have aldehyde or ketone groups, thus they will not give a positive Fehling's test.

- **Sucrose**: Sucrose is a disaccharide composed of glucose and fructose. It does not have a free aldehyde group because it is a non-reducing sugar. Therefore, it will give a negative Fehling's test.

- **Glucose**: Glucose is a monosaccharide that contains an aldehyde group. It is a reducing sugar and will react with Fehling's solution, resulting in the formation of cuprous oxide (Cu2O), which appears as a red precipitate. Thus, glucose will give a positive Fehling's test.

### Step 4: Conclusion
Based on the analysis, the only option that gives a positive Fehling's solution test is **Glucose**.

### Final Answer
**Glucose** gives a positive Fehling's solution test.

---