Glucose reacts with HCN to give

Options

A. Saccharic acid
B. Cyanohydrin
C. n-hexane
D. Gluconic

Answer

To solve the question of what product is formed when glucose reacts with HCN, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactant in this case is glucose, which has the molecular formula C₆H₁₂O₆.

2. **Understand the Reaction**:
- Glucose contains a carbonyl group (C=O) in its structure. When it reacts with HCN (hydrogen cyanide), the cyanide ion (CN⁻) acts as a nucleophile.

3. **Mechanism of Reaction**:
- The nucleophile (CN⁻) attacks the electrophilic carbon of the carbonyl group in glucose. This leads to the formation of a new bond between the carbon atom and the cyanide group.

4. **Formation of Cyanohydrin**:
- As a result of the nucleophilic attack, a hydroxyl group (OH) is also present on the carbon that was originally part of the carbonyl group. This results in the formation of a cyanohydrin.

5. **Product Structure**:
- The product formed is called "cyanohydrin," which has both a hydroxyl group (OH) and a cyanide group (CN) attached to the same carbon atom. The structure can be represented as follows:
- The carbon that was part of the carbonyl now has a hydroxyl group and a cyanide group, making it a cyanohydrin.

6. **Conclusion**:
- Therefore, when glucose reacts with HCN, the product formed is cyanohydrin.

### Final Answer:
The product of the reaction between glucose and HCN is **cyanohydrin**.

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