Draw the most stable Newman projection formula along `C_(1)-C_(2)` bonds of following compounds.
(I) `overset(1)(C)H_(3)-overset(2)(C)H_(2)-CH_(3)` (ii) `overset(1)(C)H_(3)-overset(2)underset(overset(|)(CH_(3)))(C)H-CH_(3)` (iii) `CH_(3)-overset(underset(|)(CH_(3)))(underset(1)(C))H-overset(underset(|)(CH_(3)))(underset(2)(C))H-CH_(3)` (iv) `HO-overset(1)(C)H_(2)-overset(2)(C)H_(2)-F`

Answer

To draw the most stable Newman projection formulas for the given compounds along the `C1-C2` bonds, we will follow a systematic approach for each compound. Here’s the step-by-step solution for each part of the question:

### (I) `C1H3-C2H2-CH3`

1. **Identify the Carbons**: Identify `C1` and `C2`. Here, `C1` is attached to three hydrogens (H) and `C2` is attached to two hydrogens and one methyl group (CH3).

2. **Draw the Newman Projection**:
- For `C1`, place the three hydrogens in a staggered arrangement.
- For `C2`, place the methyl group (CH3) in front and the two hydrogens staggered behind.

3. **Final Structure**:
```
H
|
H - C1 - C2 - CH3
|
H
```

### (II) `C1H3-C2(CH3)-CH3`

1. **Identify the Carbons**: Here, `C1` has three hydrogens and `C2` has one hydrogen and two methyl groups (CH3).

2. **Draw the Newman Projection**:
- For `C1`, place the three hydrogens in a staggered arrangement.
- For `C2`, place the two methyl groups (CH3) staggered behind the hydrogen.

3. **Final Structure**:
```
CH3
|
H - C1 - C2 - CH3
|
H
```

### (III) `CH3-C1(CH3)-C2(CH3)-CH3`

1. **Identify the Carbons**: `C1` and `C2` both have two methyl groups and one hydrogen.

2. **Draw the Newman Projection**:
- For `C1`, place the two methyl groups and one hydrogen in a staggered arrangement.
- For `C2`, place the two methyl groups and one hydrogen staggered behind.

3. **Final Structure**:
```
CH3
|
CH3 - C1 - C2 - CH3
|
H
```

### (IV) `HO-C1H2-C2H2-F`

1. **Identify the Carbons**: `C1` has two hydrogens and `C2` has one hydrogen and one fluorine.

2. **Draw the Newman Projection**:
- For `C1`, place the two hydrogens in a staggered arrangement.
- For `C2`, place the fluorine (F) and the hydrogen staggered behind.

3. **Final Structure**:
```
OH
|
H - C1 - C2 - F
|
H
```