The compound most suitable for the preparation of cyanohydrin is

Options

A. `C_(2)H_(5)COOH`
B. `C_(6)H_(5)NH_(2)`
C. `C_(2)H_(5)COC_(2)H_(5)`
D. `C_(2)H_(5)-C_(2)H_(5)`

Explanation

To determine the compound most suitable for the preparation of cyanohydrin, we need to understand that cyanohydrins are formed from carbonyl compounds (aldehydes or ketones) when they react with hydrogen cyanide (HCN). Let's analyze the options provided step by step.

### Step-by-Step Solution:

1. **Understanding Cyanohydrin Formation**:
- Cyanohydrins are produced by the nucleophilic addition of HCN to carbonyl compounds (aldehydes or ketones).
- The general reaction can be represented as:
\[ R_2C=O + HCN \rightarrow R_2C(OH)(CN) \]
- Here, \( R_2C=O \) represents a carbonyl compound.

2. **Analyzing the Options**:
- **Option 1: Carboxylic Acid** (e.g., RCOOH)
- Carboxylic acids do not have the carbonyl structure necessary for cyanohydrin formation. Therefore, this option is **not suitable**.

- **Option 2: Aniline (C6H5NH2)**
- Aniline contains an amine group and lacks a carbonyl group. Thus, it cannot form cyanohydrin. This option is also **not suitable**.

- **Option 3: Ketone (C2H5COC2H5)**
- This is a ketone, which contains a carbonyl group. Ketones can react with HCN to form cyanohydrins. This option is **suitable**.

- **Option 4: Alkane (C2H5C2H5)**
- Alkanes do not contain a carbonyl group and cannot undergo the reaction to form cyanohydrin. Hence, this option is **not suitable**.

3. **Conclusion**:
- The most suitable compound for the preparation of cyanohydrin is **Option 3: C2H5COC2H5 (a ketone)**.

### Summary of the Solution:
The compound most suitable for the preparation of cyanohydrin is the ketone \( C2H5COC2H5 \).