Which of the following contain a nitro group ?

Options

A. martius yellow
B. chloramphenicol
C. benzylpenicillin
D. sulphapyridine

Answer

To determine which of the given compounds contain a nitro group (NO2), we can follow these steps:

### Step 1: Understand what a nitro group is
A nitro group is a functional group consisting of one nitrogen atom bonded to two oxygen atoms (NO2). It is important to identify this group in the structures of the compounds provided.

### Step 2: Analyze the compounds
We have four compounds to analyze:
1. Martius Yellow
2. Chloramphenicol
3. Pencil Penicillin
4. Sulphapyridin

### Step 3: Draw or visualize the structures of each compound
- **Martius Yellow**: This is an organic dye. Its structure contains a nitro group.
- **Chloramphenicol**: This is an antibiotic. Upon examining its structure, it also contains a nitro group.
- **Pencil Penicillin**: This is another antibiotic. Its structure does not contain a nitro group.
- **Sulphapyridin**: This is a sulfonamide. Its structure does not contain a nitro group.

### Step 4: Identify the compounds with a nitro group
From our analysis:
- Martius Yellow contains a nitro group.
- Chloramphenicol contains a nitro group.
- Pencil Penicillin does not contain a nitro group.
- Sulphapyridin does not contain a nitro group.

### Step 5: Conclusion
The compounds that contain a nitro group are:
1. Martius Yellow
2. Chloramphenicol

### Final Answer
The compounds that contain a nitro group are Martius Yellow and Chloramphenicol.

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