Which of the following compounds does not have a carboxyl group ?

Options

A. Benzoic acid
B. Palmitic acid
C. Picric acid
D. Oleic acid

Explanation

To determine which of the following compounds does not have a carboxyl group, we will analyze each compound one by one. The carboxyl group is characterized by the presence of a carbonyl (C=O) and a hydroxyl (–OH) group, represented as –COOH.

### Step-by-Step Solution:

1. **Identify the Compounds**:
The compounds we need to analyze are:
- Benzoic Acid
- Palmitic Acid
- Picric Acid
- Oleic Acid

2. **Analyze Benzoic Acid**:
- Structure: Benzoic acid has a benzene ring with a carboxyl group attached.
- Formula: C6H5COOH
- Conclusion: Benzoic acid **contains** a carboxyl group.

3. **Analyze Palmitic Acid**:
- Structure: Palmitic acid is a long-chain fatty acid with a carboxyl group at one end.
- Formula: CH3(CH2)14COOH
- Conclusion: Palmitic acid **contains** a carboxyl group.

4. **Analyze Picric Acid**:
- Structure: Picric acid is a nitrophenol derivative with three nitro groups and does not have a carboxyl group.
- Formula: C6H3N3O7
- Conclusion: Picric acid **does not contain** a carboxyl group.

5. **Analyze Oleic Acid**:
- Structure: Oleic acid is an unsaturated fatty acid with a carboxyl group at one end.
- Formula: C18H34O2
- Conclusion: Oleic acid **contains** a carboxyl group.

6. **Final Conclusion**:
From the analysis, the compound that does not have a carboxyl group is **Picric Acid**.

### Answer:
**Picric Acid does not have a carboxyl group.**

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