How many acidic group is present in given amino acid ?
`overset(o+)(N)H_(3)-underset(CO_(2)^(-))underset(|)(CH)-CH_(2)-CO_(2)H`

Answer

To determine how many acidic groups are present in the given amino acid, we will analyze the structure step by step.

### Step 1: Identify the Structure
The given amino acid structure is represented as:
\[ \overset{(o^+)}{N}H_{3} - \underset{(CO_{2}^{-})}{C} - \underset{|}{CH} - CH_{2} - CO_{2}H \]

### Step 2: Define Acidic Groups
An acidic group is defined as a functional group that can donate a proton (H⁺) in solution. Common acidic groups include carboxylic acids (-COOH) and ammonium ions (NH₄⁺).

### Step 3: Analyze Each Functional Group
1. **Carboxylic Acid Group (-COOH)**:
- The -COOH group is present at the end of the structure. This group can donate a proton (H⁺) due to the presence of the hydroxyl (-OH) part. Therefore, this group is acidic.

2. **Ammonium Ion (NH₃⁺)**:
- The nitrogen (N) in the structure has a positive charge (NH₃⁺). A positively charged nitrogen can also donate a proton to become neutral (NH₂). Thus, this group is also considered acidic.

3. **Middle Carbons**:
- The two middle carbons (connected by single bonds) do not have any acidic hydrogen atoms. The carbon atoms are sp³ hybridized and do not exhibit acidic behavior.

### Step 4: Count the Acidic Groups
From the analysis:
- The -COOH group contributes **1 acidic group**.
- The NH₃⁺ group contributes **1 acidic group**.

### Conclusion
In total, there are **2 acidic groups** present in the given amino acid.

### Final Answer
**2 acidic groups**

---