Which is/are not the structure of 3-Methyl butan -2-ol.

Options

A.
B.
C.
D.

Answer

To determine which structures are not representative of 3-Methylbutan-2-ol, we need to analyze each option based on the IUPAC naming conventions and the structural requirements of the compound.

### Step-by-Step Solution:

1. **Identify the Structure of 3-Methylbutan-2-ol:**
- The base structure is butan-2-ol, which means it has a four-carbon chain (butane) with an -OH (hydroxyl) group on the second carbon.
- The "3-methyl" indicates that there is a methyl (-CH₃) group attached to the third carbon of the butane chain.

2. **Draw the Correct Structure:**
- The correct structure can be drawn as follows:
```
CH3
|
CH3-CH-CH2-OH
|
CH3
```
- This structure confirms that the -OH group is on the second carbon and a methyl group is on the third carbon.

3. **Analyze Each Option:**
- **Option A:** Check if it matches the structure of 3-Methylbutan-2-ol.
- If it has the correct chain and functional group placement, it is valid.
- **Option B:** Similar to option A, check for the correct placement of the -OH group and the methyl group.
- **Option C:** Analyze the structure to see if it has the correct carbon chain and functional groups.
- If it deviates from the required structure, it is not 3-Methylbutan-2-ol.
- **Option D:** Again, check the structure for the correct placement of functional groups and carbon chain.
- If it does not match, it is also not 3-Methylbutan-2-ol.

4. **Conclusion:**
- After analyzing all options, identify which ones do not conform to the structure of 3-Methylbutan-2-ol.
- Based on the analysis, options C and D are determined to be incorrect structures.

### Final Answer:
The structures that are not 3-Methylbutan-2-ol are **Option C and Option D**.