How many primary, secondary, tertiary and quaternary carbon atoms are present in the following compound?
`CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`

Options

A. One primary, two secondary and one tertiary
B. Five primary, three secondary
C. Five primary, one secondary, one tertiary and one quaternary
D. four primary, two secondary and two quaternary

Answer

To determine the number of primary, secondary, tertiary, and quaternary carbon atoms in the given compound, we will follow these steps:

### Step 1: Understand the Definitions
- **Primary Carbon (1°)**: A carbon atom bonded to three hydrogen atoms (–CH₃).
- **Secondary Carbon (2°)**: A carbon atom bonded to two hydrogen atoms and one carbon atom (–CH₂–).
- **Tertiary Carbon (3°)**: A carbon atom bonded to one hydrogen atom and two carbon atoms (–CH–).
- **Quaternary Carbon (4°)**: A carbon atom bonded to no hydrogen atoms and four carbon atoms (–C–).

### Step 2: Draw the Structure
The compound can be represented as follows:
```
CH₃
|
CH₃ - C - CH₂ - C - CH₃
|
CH₃
```
Number the carbon atoms from left to right:
1. C1
2. C2
3. C3
4. C4
5. C5
6. C6
7. C7
8. C8

### Step 3: Analyze Each Carbon Atom
- **C1**: Bonded to 3 H atoms → Primary (1°)
- **C2**: Bonded to 1 H atom and 2 C atoms → Tertiary (3°)
- **C3**: Bonded to 3 H atoms → Primary (1°)
- **C4**: Bonded to 2 H atoms and 1 C atom → Secondary (2°)
- **C5**: Bonded to 3 H atoms → Primary (1°)
- **C6**: Bonded to 0 H atoms and 4 C atoms → Quaternary (4°)
- **C7**: Bonded to 3 H atoms → Primary (1°)
- **C8**: Bonded to 3 H atoms → Primary (1°)

### Step 4: Count Each Type of Carbon
- **Primary Carbons (1°)**: C1, C3, C5, C7, C8 → Total = 5
- **Secondary Carbons (2°)**: C4 → Total = 1
- **Tertiary Carbons (3°)**: C2 → Total = 1
- **Quaternary Carbons (4°)**: C6 → Total = 1

### Final Count
- **Primary Carbons**: 5
- **Secondary Carbons**: 1
- **Tertiary Carbons**: 1
- **Quaternary Carbons**: 1

### Conclusion
The compound contains:
- 5 primary carbon atoms
- 1 secondary carbon atom
- 1 tertiary carbon atom
- 1 quaternary carbon atom