The acid which does not contain carboxylic group is

Options

A. Pyruvic acid
B. Alanine
C. Cinnamic acid
D. Picric acid

Answer

To determine which acid does not contain a carboxylic group, we first need to understand what a carboxylic group is. The carboxylic group is characterized by the presence of a carbonyl (C=O) and a hydroxyl (–OH) group, typically represented as –COOH.

### Step-by-Step Solution:

1. **Identify the Carboxylic Group**:
The carboxylic group is defined as –COOH. This means any acid that has this functional group will be classified as a carboxylic acid.

2. **List Common Acids**:
We will consider several acids to check for the presence of the carboxylic group:
- Pyruvic acid: CH3C(=O)COOH
- Alanine: CH3CH(NH2)COOH
- Cinnamic acid: C6H5CH=CHCOOH
- Picric acid: C6H3(OH)(NO2)3

3. **Analyze Each Acid**:
- **Pyruvic Acid**: Contains –COOH (carboxylic group).
- **Alanine**: Contains –COOH (carboxylic group).
- **Cinnamic Acid**: Contains –COOH (carboxylic group).
- **Picric Acid**: Does not contain –COOH (carboxylic group).

4. **Conclusion**:
Among the acids listed, picric acid is the only one that does not contain a carboxylic group. Therefore, picric acid is the correct answer.

### Final Answer:
The acid which does not contain a carboxylic group is **picric acid**.