`CH_(3) - underset(H) underset(|)overset(OH)overset(|)(C ) - CN ` is

Options

A. Acetaldehyde cyanohydrin
B. Acetone cyanohydrin
C. Cyanoethanol
D. Ethanol nitrile

Explanation

To solve the problem, we need to analyze the given chemical structure CH₃CHOHCN and identify what it represents.

### Step-by-Step Solution:

1. **Identify the Structure**:
The given structure is CH₃CHOHCN. This can be broken down as follows:
- CH₃- indicates a methyl group.
- CHO- indicates an aldehyde functional group.
- OH- indicates a hydroxyl group.
- CN- indicates a cyano group.

2. **Recognize the Functional Groups**:
The presence of the aldehyde (CHO) and the cyano group (CN) suggests that this compound is derived from an aldehyde with a cyano group attached. The hydroxyl group (OH) indicates that it could be a hydroxy compound.

3. **Determine the Base Structure**:
The base structure appears to be acetaldehyde (CH₃CHO), which is a 2-carbon aldehyde.

4. **Reaction with Hydrogen Cyanide (HCN)**:
When acetaldehyde reacts with hydrogen cyanide (HCN), it undergoes a nucleophilic addition reaction. The cyano group (CN) adds to the carbonyl carbon of the aldehyde, forming a cyanohydrin.

5. **Formation of the Product**:
The product formed from this reaction is known as acetaldehyde cyanohydrin. The structure can be represented as CH₃C(OH)(CN)H, indicating that the hydroxyl (OH) and cyano (CN) groups are attached to the same carbon atom.

6. **Conclusion**:
Therefore, the compound CH₃CHOHCN is identified as acetaldehyde cyanohydrin.

### Final Answer:
The correct answer is **Acetaldehyde Cyanohydrin**.