Does picric acid contain a carboxyl group ?

Answer

To determine whether picric acid contains a carboxyl group, we can follow these steps:

### Step 1: Understand the Structure of Picric Acid
Picric acid is chemically known as 2,4,6-trinitrophenol. It consists of a phenolic structure with three nitro (NO2) groups attached to the benzene ring.

### Step 2: Identify the Carboxyl Group
A carboxyl group is defined as -COOH. This group consists of a carbon atom double-bonded to an oxygen atom (C=O) and also single-bonded to a hydroxyl group (OH).

### Step 3: Analyze the Structure of Picric Acid
In the structure of picric acid, we can see:
- A benzene ring.
- Three nitro groups (NO2) attached to the ring.
- One hydroxyl group (OH) attached to the ring.

### Step 4: Check for the Presence of the Carboxyl Group
Upon examining the structure, we find that there is no -COOH group present in picric acid. The only functional groups present are the hydroxyl group and the nitro groups.

### Step 5: Conclusion
Since picric acid does not contain a carboxyl group, we conclude that the answer to the question is "No."

### Final Answer
No, picric acid does not contain a carboxyl group.

---