`IUPAC` name of picric acid is

Options

A. `2,4,6`-Trinitrobenzene carboxylic acid
B. `2,4`-Dinitrobenzene carboxylic acid
C. `2,4,6`-Trinitrophenol
D. `2,4`-Dinitrophenol

Answer

To determine the IUPAC name of picric acid, we can follow these steps:

### Step 1: Identify the Structure of Picric Acid
Picric acid is known to be a phenolic compound with three nitro groups attached to the benzene ring. The basic structure can be represented as a phenol (C6H5OH) with three nitro (NO2) groups.

### Step 2: Determine the Position of Nitro Groups
In picric acid, the nitro groups are located at the 2, 4, and 6 positions of the benzene ring. This is crucial for naming the compound correctly.

### Step 3: Assign the Main Functional Group
The main functional group in picric acid is the hydroxyl group (-OH), which classifies it as a phenol. The presence of the nitro groups enhances the acidity of the compound.

### Step 4: Use Correct Nomenclature
According to IUPAC nomenclature rules, we need to indicate the positions of the nitro groups on the phenolic compound. Since there are three nitro groups, we will use the prefix "tri" to denote this.

### Step 5: Combine the Information
Putting all the information together, we can name the compound as follows:
- The base name is "phenol".
- The positions of the nitro groups are 2, 4, and 6.
- Since there are three nitro groups, we use "trinitro".

Thus, the IUPAC name of picric acid is **2, 4, 6-Trinitrophenol**.

### Final Answer
The IUPAC name of picric acid is **2, 4, 6-Trinitrophenol**.

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