`{:(" "CHO),(" |"),(" "H-C-OH),(" |"),(A overset(H_(2)//NI)rarrHO-C-Hoverset("Heating with HI")rarrB),(" |"),(" "H-C-OH),(" |"),(" "H-C-OH),(" |"),(" "CH_(2)OH):}`
A and B can be :

Options

A. Both are n-Hexane
B. Both are Hexan-1,2,3,4,5,6-hexaol
C. A is n-Hexane B is Hexan-1,2,3,4,5,6-hexaol
D. A is Hexane-1,2,3,4,5,6-hexol and B is n-Hexane

Answer

To solve the problem, we need to analyze the reactions of glucose (CHOH) with hydrogen iodide (HI) and hydrogen in the presence of nickel (Ni) catalyst.

### Step-by-Step Solution:

1. **Identify the Starting Compound**:
The starting compound is glucose, which has the structure:
\[ \text{CHO} \\ \text{H-C-OH} \\ \text{H-C-OH} \\ \text{H-C-OH} \\ \text{H-C-OH} \\ \text{CH}_2\text{OH} \]

2. **Reaction with Hydrogen Iodide (HI)**:
When glucose is heated with hydrogen iodide (HI), a reduction reaction occurs. The aldehyde group (CHO) in glucose is reduced to a primary alcohol (CH2OH). This leads to the formation of a normal sugar alcohol, which is sorbitol. The reaction can be summarized as:
\[ \text{Glucose} \xrightarrow{\text{HI}} \text{Sorbitol} \]

3. **Structure of Sorbitol**:
The structure of sorbitol is:
\[ \text{CH}_2\text{OH} \\ \text{H-C-OH} \\ \text{H-C-OH} \\ \text{H-C-OH} \\ \text{H-C-OH} \\ \text{CH}_2\text{OH} \]
Sorbitol is a sugar alcohol with the formula C6H14O6, which can also be represented as 1,2,3,4,5,6-hexane-hexol.

4. **Reaction with Hydrogen (H2) in presence of Nickel (Ni)**:
When glucose is treated with hydrogen gas in the presence of a nickel catalyst, it also undergoes a reduction. The aldehyde group (CHO) is again reduced to a primary alcohol (CH2OH), resulting in the formation of the same product, sorbitol.

5. **Final Products**:
- Product A (from the reaction with H2/Ni) is sorbitol (1,2,3,4,5,6-hexane-hexol).
- Product B (from the reaction with HI) is a normal sugar alcohol, which is also sorbitol.

6. **Conclusion**:
Therefore, both products A and B are the same compound, which is sorbitol, and can be represented as:
- A: 1,2,3,4,5,6-hexane-hexol (sorbitol)
- B: Normal sugar alcohol (sorbitol)

### Answer:
The correct option is D: A is 1,2,3,4,5,6-hexane-hexol (sorbitol) and B is a normal sugar alcohol (sorbitol).

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