The number of chiral carbon atoms in Aspartame is _________.

Explanation

To determine the number of chiral carbon atoms in aspartame, we will analyze its structure step by step. A carbon atom is considered chiral if it is attached to four different groups.

### Step-by-Step Solution:

1. **Identify the Structure of Aspartame**:
Aspartame is a dipeptide composed of phenylalanine and aspartic acid. Its chemical structure can be represented as:
- C14H18N2O5

2. **Examine Each Carbon Atom**:
We will go through each carbon atom in the structure to check if it is chiral.

3. **Check Carbon Atoms**:
- **Carbon 1**: This carbon has three groups attached (two hydrogens and one other group). **Not chiral**.
- **Carbon 2**: This carbon has two identical hydrogens. **Not chiral**.
- **Carbon 3**: This carbon has one NH2, one hydrogen, and two different groups. **Chiral**.
- **Carbon 4**: This carbon has one NH and one oxygen, with two other groups. **Not chiral**.
- **Carbon 5**: This carbon has one hydrogen, one NH, and two different groups. **Chiral**.
- **Carbons in the Benzene Ring**: All these carbons have only three groups attached (due to the nature of the ring structure). **Not chiral**.
- **Remaining Carbons**: Check each remaining carbon similarly; if they have less than four different groups, they are **not chiral**.

4. **Count the Chiral Carbons**:
After analyzing the structure, we find that there are **two chiral carbon atoms** in aspartame.

### Final Answer:
The number of chiral carbon atoms in aspartame is **2**.

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