Enumerate the reactions of `D`-Glucose which cannot be explained by its open-chain structure.

Explanation

To enumerate the reactions of D-Glucose that cannot be explained by its open-chain structure, we need to analyze its properties and behavior in different chemical tests. Here is a step-by-step solution:

### Step 1: Understanding the Structure of D-Glucose
D-Glucose is a monosaccharide that can exist in two forms: an open-chain (linear) structure and a cyclic structure (pyranose form). The open-chain form contains an aldehyde group (CHO) at one end.

### Step 2: Identifying the Reactions
1. **2,4-Dinitrophenylhydrazine (2,4-DNP) Test**:
- In the open-chain structure, D-Glucose should theoretically react with 2,4-DNP to form a hydrazone. However, D-Glucose does not give this test, indicating that it does not exist predominantly in the open-chain form in solution.
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