`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 determine the compound X in the reaction sequence given, we can follow these steps:

### Step 1: Analyze the Reaction Sequence
The reaction sequence is as follows:
1. \( X + NH_3 \overset{50^{\circ}C}{\rightarrow} Y \)
2. \( Y \overset{H^+/H_2O}{\rightarrow} H_2N-CH_2COOH \)

Here, \( H_2N-CH_2COOH \) is identified as glycine (or 2-aminoacetic acid).

### Step 2: Identify Compound Y
From the second step of the reaction, we know that \( Y \) must be a compound that, when hydrolyzed in the presence of \( H^+ \) and \( H_2O \), produces glycine. This suggests that \( Y \) is likely an intermediate that contains a functional group that can be converted into an amino acid.

### Step 3: Determine the Structure of Compound X
To find \( X \), we need to consider what could react with ammonia to yield \( Y \). Given that \( Y \) leads to glycine, it is reasonable to assume that \( Y \) is an amino acid derivative.

### Step 4: Consider Possible Candidates for X
The most likely candidates for \( X \) are halogenated acetic acids, as they can react with ammonia to form amino acids. The options include:
1. Bromoacetic acid
2. Chloroacetic acid
3. Acetic acid

### Step 5: Analyze Bromoacetic Acid
Bromoacetic acid (\( BrCH_2COOH \)) is an alpha-halo acid. When it reacts with ammonia, it can undergo nucleophilic substitution where the bromine atom is replaced by an amino group, resulting in the formation of an intermediate that can hydrolyze to yield glycine.

### Step 6: Confirm the Reaction
The reaction can be summarized as:
- Bromoacetic acid reacts with ammonia to form an intermediate (which is likely \( Y \)).
- Hydrolysis of this intermediate leads to glycine.

### Conclusion
Based on the analysis, the compound \( X \) is **Bromoacetic Acid**.