Which of the following statements is correct ?

Options

A. Gluconic acid can form cyclic (acetal/hemiacetal ) strucutre
B. Gluconic acid is a partial oxidation product of glucose
C. Gluconic acid is obtained by oxidation of glucose with `HNO_(3)`
D. Gluconic acid is a dicarboxylic acid

Answer

To solve the question regarding gluconic acid and determine which statement is correct, we will analyze each statement step by step.

### Step 1: Understanding Gluconic Acid
Gluconic acid is a carboxylic acid derived from glucose. It is formed when glucose undergoes oxidation. The structure of gluconic acid includes one carboxyl group (-COOH) and a hydroxymethyl group (-CH2OH).

### Step 2: Evaluating Each Statement
1. **Statement 1: Gluconic acid can form cyclic structure.**
- Gluconic acid has an aldehyde group in glucose, which can form a cyclic structure (hemiacetal) when it reacts with alcohol. However, in its oxidized form, gluconic acid does not have an aldehyde group available to form a cyclic hemiacetal. Therefore, this statement is **incorrect**.

2. **Statement 2: Gluconic acid is a partial oxidation product of glucose.**
- Gluconic acid is indeed formed by the partial oxidation of glucose. This statement is **correct**.

3. **Statement 3: Gluconic acid is obtained by oxidation of glucose with HNO3.**
- Gluconic acid is not produced by oxidation with nitric acid (HNO3). Instead, it is produced by the oxidation of glucose using bromine water (Br2 in water). Therefore, this statement is **incorrect**.

4. **Statement 4: Gluconic acid is a dicarboxylic acid.**
- Gluconic acid contains only one carboxylic acid group, making it a monocarboxylic acid, not a dicarboxylic acid. Thus, this statement is **incorrect**.

### Conclusion
After evaluating all the statements, the only correct statement is:
- **Statement 2: Gluconic acid is a partial oxidation product of glucose.**

### Final Answer
The correct statement is: **Gluconic acid is a partial oxidation product of glucose.**

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