Glucose upo Ruff's degradation produces

Options

A. Mannose
B. Ribose
C. Arabinose
D. Erythrose

Answer

To solve the question "Glucose upon Ruff's degradation produces," we will follow these steps:

### Step 1: Understand Ruff's Degradation
Ruff's degradation is a two-step process that involves the oxidation of glucose. The first step involves the reaction of glucose with bromine water, which oxidizes the aldehyde group of glucose to form a carboxylic acid.

### Step 2: Draw the Structure of Glucose
Glucose is a six-carbon sugar (C6H12O6) with the following structure:

```
CHO
|
H-C-OH
|
H-C-OH
|
H-C-OH
|
H-C-OH
|
CH2OH
```

### Step 3: First Step of Ruff's Degradation
In the first step, when glucose reacts with bromine water, the aldehyde group (CHO) is oxidized to a carboxylic acid (COOH). The resulting compound is gluconic acid (C6H12O7).

### Step 4: Second Step of Ruff's Degradation
In the second step, we add peroxide and ferric sulfate. The carboxylic acid group is oxidized and releases carbon dioxide (CO2), while the terminal alcohol group (CH2OH) is converted into an aldehyde group (CHO).

### Step 5: Determine the Number of Carbon Atoms
After the two steps of Ruff's degradation, we are left with a carbohydrate that has 5 carbon atoms instead of 6.

### Step 6: Identify the Product
Now we need to identify which of the given options corresponds to a 5-carbon sugar:
- **Mannose**: This is a 6-carbon sugar, so it is incorrect.
- **Ribose**: This is a 5-carbon sugar, but it has 3 hydroxyl groups, making it incorrect for our product.
- **Arabinose**: This is a 5-carbon sugar and fits the criteria.
- **Erythrose**: This is a 4-carbon sugar, so it is incorrect.

### Conclusion
Thus, the correct answer is that glucose upon Ruff's degradation produces **Arabinose**.

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