Which of the Newman projections shown below represents the most stable conformation about the `C_(1)-C_(2)` bond of 1-iodo-2-methyl propance?

Options

A.
B.
C.
D.

Explanation

To determine which Newman projection represents the most stable conformation about the C1-C2 bond of 1-iodo-2-methylpropane, we can follow these steps:

### Step 1: Draw the Structure of 1-Iodo-2-methylpropane
1. Identify the structure of 1-iodo-2-methylpropane:
- The main chain is propane (3 carbon atoms).
- The first carbon (C1) has an iodine (I) substituent.
- The second carbon (C2) has a methyl (CH3) substituent.
- The third carbon (C3) has two hydrogen atoms (H).

The structure can be represented as:
```
CH3
|
H3C - C - CH2 - I
|
H
```

### Step 2: Identify the Newman Projections
2. Analyze the given Newman projections:
- Each projection represents the conformation of the molecule when looking down the C1-C2 bond.
- We need to evaluate the steric interactions in each projection.

### Step 3: Evaluate Steric Hindrance
3. For each Newman projection, assess the steric hindrance:
- **Staggered Conformation**: This is generally more stable as it minimizes steric hindrance between bulky groups.
- **Eclipsed Conformation**: This is less stable due to increased steric hindrance as groups are aligned with each other.

### Step 4: Compare the Projections
4. Compare the four projections:
- **Projection A**: Check for steric hindrance; if there are bulky groups eclipsing each other, this is less stable.
- **Projection B**: Similar evaluation; look for eclipsing interactions.
- **Projection C**: If this shows a staggered conformation with minimal hindrance, it may be more stable.
- **Projection D**: Again, check for steric hindrance.

### Step 5: Determine the Most Stable Conformation
5. Identify the most stable conformation:
- After analyzing all projections, the one with the least steric hindrance and in a staggered arrangement will be the most stable.
- Based on the analysis, **Projection C** is determined to be the most stable conformation due to its staggered arrangement, minimizing steric interactions.

### Conclusion
The most stable conformation about the C1-C2 bond of 1-iodo-2-methylpropane is represented by **Projection C**.

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