`X+NH_(3)overset(50^(@)C)toYoverset(H^(+)//H_(2)O)toH_(2)N-CH_(2)COOH`
Compound X is

Options

A. Chloroacetic acid
B. Bromoacetic acid
C. outside the helix
D. Acetic acid

Answer

To solve the question, we need to identify the compound X that reacts with ammonia (NH₃) to form compound Y, which then undergoes hydrolysis to produce an amino acid (specifically, H₂N-CH₂COOH).

### Step-by-Step Solution:

1. **Understanding the Reaction**:
The reaction involves a compound X reacting with ammonia (NH₃) at 50°C to form compound Y, which subsequently undergoes hydrolysis to yield an amino acid.

2. **Identifying the Structure of Compound Y**:
The final product after hydrolysis is H₂N-CH₂COOH, which is glycine, an amino acid. This indicates that compound Y must be an intermediate that can lead to the formation of glycine.

3. **Analyzing Possible Compounds for X**:
We need to consider compounds that can react with ammonia to form an amine (which will be compound Y) and then can be hydrolyzed to yield glycine.

4. **Considering Bromoacetic Acid**:
- Bromoacetic acid (BrCH₂COOH) is an alpha halo acid.
- When it reacts with ammonia, the bromine atom (a good leaving group) is replaced by an amino group (NH₂), leading to the formation of NH₂CH₂COOH (glycine) after hydrolysis.
- The reaction can be summarized as:
\[ \text{BrCH}_2\text{COOH} + \text{NH}_3 \rightarrow \text{NH}_2\text{CH}_2\text{COOH} + \text{HBr} \]

5. **Considering Other Options**:
- **Chloroacetic Acid (ClCH₂COOH)**: Similar to bromoacetic acid, but chlorine is a poorer leaving group than bromine. While it can also react with ammonia, the reaction is less favorable compared to bromoacetic acid.
- **Acetic Acid (CH₃COOH)**: This does not have a halogen to replace with an amino group and would form an amide instead, which is not the desired product.
- **Other Options**: Any other compounds that do not contain a good leaving group or do not lead to the formation of an amino acid after hydrolysis can be ruled out.

6. **Conclusion**:
After analyzing the options, the best candidate for compound X is **bromoacetic acid** because it can effectively react with ammonia to form glycine after hydrolysis.

### Final Answer:
Compound X is **bromoacetic acid (BrCH₂COOH)**.