Which one is an amino acids?

Options

A. `CH_(3)-overset(NH_(2))overset(|)(CH)-overset(O)overset(||)(C)-OH`
B. `CH_(3)-CH_(2)-overset(O)overset(||)(C)- O-NH_(4)`
C. `CH_(3)-CH_(2)-overset(O)overset(||)(C)-NH_(2)`
D. `CH_(3)-CH-NH_(2)-overset(O)overset(||)(C)-Cl`

Answer

To determine which of the given structures is an amino acid, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Amino Acids**:
Amino acids are organic compounds characterized by the presence of both an amino group (-NH2) and a carboxyl group (-COOH) attached to a central carbon atom (the alpha carbon). The general formula for an amino acid can be represented as R-CH(NH2)-COOH, where R represents the variable alkyl group.

2. **Analyze the Given Structures**:
We need to look at each of the four structures provided in the question and identify which one contains both the amino group and the carboxyl group.

3. **Identify the Correct Structure**:
- **Option 1**: Check if it has -NH2 and -COOH. If it has both, it is likely an amino acid.
- **Option 2**: Look for -NH2 and -COOH. If it has a different functional group instead, it is not an amino acid.
- **Option 3**: Again, check for the presence of -NH2 and -COOH.
- **Option 4**: Repeat the analysis for this structure.

4. **Conclusion**:
After analyzing the structures, we find that **Option 1** contains both the amino group (-NH2) and the carboxyl group (-COOH) attached to the central carbon, making it the correct answer. The other options do not have both functional groups necessary to classify them as amino acids.

### Final Answer:
**Option 1 is the amino acid.**

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