Which of the following is the correct structure of a narcotic analgesic called morphine?

Options

A.
B.
C.
D.

Answer

To determine the correct structure of the narcotic analgesic morphine, we will follow these steps:

### Step 1: Understand the Basic Structure of Morphine
Morphine is an opiate derived from the opium poppy and is known for its pain-relieving properties. Its structure includes several key functional groups, including a phenolic hydroxyl group and a tertiary amine.

### Step 2: Identify the Key Components
Morphine has a fused ring system that consists of:
- A benzene ring (aromatic ring)
- A piperidine ring (a six-membered ring containing nitrogen)
- A cyclohexene ring (part of the fused ring system)

### Step 3: Draw the Basic Framework
Start by sketching the fused ring system:
- Draw the benzene ring.
- Attach the piperidine ring to the benzene.
- Include the cyclohexene ring as part of the structure.

### Step 4: Add Functional Groups
Next, add the functional groups:
- Add a hydroxyl group (-OH) to the benzene ring.
- Ensure that the nitrogen atom in the piperidine ring is correctly positioned.

### Step 5: Finalize the Structure
Ensure that all hydrogen atoms are accounted for and that the stereochemistry is correct. Morphine has specific stereochemical configurations that are important for its biological activity.

### Step 6: Verify the Structure
Cross-reference your drawn structure with known references or textbooks to ensure accuracy. Morphine's structure is often depicted in various chemical databases.

### Final Structure of Morphine
The final structure should reflect the fused ring system with the hydroxyl group and nitrogen atom in their correct positions.

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