The number of compound/s given below which contains -COOH group is _____. (A) sulphanilic acid (B) picric acid (C) aspirin (D) ascorbic acid

Answer

To solve the question, we need to determine which of the compounds listed contains a carboxylic acid group (-COOH). Let's analyze each compound one by one.

### Step 1: Analyze Sulphanilic Acid
- **Structure**: Sulphanilic acid has a benzene ring with an amino group (-NH2) and a sulfonic acid group (-SO3H).
- **Carboxylic Acid Group**: There is no -COOH group present in sulphanilic acid.

### Step 2: Analyze Picric Acid
- **Structure**: Picric acid is a derivative of benzene with three nitro groups (-NO2) and one hydroxyl group (-OH).
- **Carboxylic Acid Group**: There is no -COOH group present in picric acid.

### Step 3: Analyze Aspirin
- **Structure**: Aspirin (acetylsalicylic acid) has a benzene ring with an acetyl group (-COCH3) and a carboxylic acid group (-COOH).
- **Carboxylic Acid Group**: Aspirin contains one -COOH group.

### Step 4: Analyze Ascorbic Acid
- **Structure**: Ascorbic acid (Vitamin C) has a complex structure that includes multiple hydroxyl groups and a lactone structure.
- **Carboxylic Acid Group**: Ascorbic acid contains one -COOH group.

### Conclusion
From the analysis:
- Sulphanilic acid: 0 -COOH groups
- Picric acid: 0 -COOH groups
- Aspirin: 1 -COOH group
- Ascorbic acid: 1 -COOH group

Thus, the total number of compounds containing the -COOH group is **2** (Aspirin and Ascorbic acid).

### Final Answer
The number of compounds that contain the -COOH group is **2**.

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