### Break Down the Problem
1. Identify the compounds listed in the options.
2. Understand the definition of a tricarboxylic acid, which is an organic acid containing three carboxyl (–COOH) groups.

### Relevant Concepts
1. **Lactic Acid**: A hydroxy acid with the formula C₃H₆O₃; it has only one carboxyl group.
2. **Adipic Acid**: A dicarboxylic acid with the formula C₆H₁₃O₄; it has two carboxyl groups.
3. **Phthalic Acid**: A dicarboxylic acid with the formula C₈H₆O₄; it also has two carboxyl groups.
4. **Citric Acid**: A tricarboxylic acid with the formula C₆H₈O₇, containing three carboxyl groups.

### Analysis and Detail
- **Lactic Acid** has one carboxyl group.
- **Adipic Acid** has two carboxyl groups.
- **Phthalic Acid** has two carboxyl groups.
- **Citric Acid**, with its structure, clearly shows three carboxyl groups.

### Verify and Summarize
Among the options provided, only Citric Acid contains three carboxyl groups, classifying it as a tricarboxylic acid.

### Final Answer
**D. Citric acid** is the correct answer.

Question

### Break Down the Problem
1. Identify the compounds listed in the options.
2. Understand the definition of a tricarboxylic acid, which is an organic acid containing three carboxyl (–COOH) groups.

### Relevant Concepts
1. **Lactic Acid**: A hydroxy acid with the formula C₃H₆O₃; it has only one carboxyl group.
2. **Adipic Acid**: A dicarboxylic acid with the formula C₆H₁₃O₄; it has two carboxyl groups.
3. **Phthalic Acid**: A dicarboxylic acid with the formula C₈H₆O₄; it also has two carboxyl groups.
4. **Citric Acid**: A tricarboxylic acid with the formula C₆H₈O₇, containing three carboxyl groups.

### Analysis and Detail
- **Lactic Acid** has one carboxyl group. 
- **Adipic Acid** has two carboxyl groups.
- **Phthalic Acid** has two carboxyl groups.
- **Citric Acid**, with its structure, clearly shows three carboxyl groups.

### Verify and Summarize
Among the options provided, only Citric Acid contains three carboxyl groups, classifying it as a tricarboxylic acid.

### Final Answer
**D. Citric acid** is the correct answer.

Knowee AI · Accepted Answer

### Break Down the Problem
1. Identify the compounds listed in the options.
2. Understand the definition of a tricarboxylic acid, which is an organic acid containing three carboxyl (–COOH) groups.

### Relevant Concepts
1. **Lactic Acid**: A hydroxy acid with the formula C₃H₆O₃; it has only one carboxyl group.
2. **Adipic Acid**: A dicarboxylic acid with the formula C₆H₁₃O₄; it has two carboxyl groups.
3. **Phthalic Acid**: A dicarboxylic acid with the formula C₈H₆O₄; it also has two carboxyl groups.
4. **Citric Acid**: A tricarboxylic acid with the formula C₆H₈O₇, containing three carboxyl groups.

### Analysis and Detail
- **Lactic Acid** has one carboxyl group. 
- **Adipic Acid** has two carboxyl groups.
- **Phthalic Acid** has two carboxyl groups.
- **Citric Acid**, with its structure, clearly shows three carboxyl groups.

### Verify and Summarize
Among the options provided, only Citric Acid contains three carboxyl groups, classifying it as a tricarboxylic acid.

### Final Answer
**D. Citric acid** is the correct answer.

Which of the following is tricarboxylic acid :A Lactic acid B Adipic acid C Phthalic acid D Citric acid

Question

Solution

Break Down the Problem

Relevant Concepts

Analysis and Detail

Verify and Summarize

Final Answer

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