Give structural formula of 4-methylpentan-2-one

Explanation

To derive the structural formula for 4-methylpentan-2-one, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parent Chain**:
- The name "pentan" indicates that the main carbon chain consists of 5 carbon atoms.

2. **Draw the Carbon Chain**:
- Start by drawing a straight chain of 5 carbon atoms. This can be represented as:
```
C1 - C2 - C3 - C4 - C5
```

3. **Number the Carbon Atoms**:
- Number the carbon atoms in the chain. We will number from one end to ensure that the functional groups get the lowest possible numbers:
```
1 - 2 - 3 - 4 - 5
```

4. **Identify the Ketone Group**:
- The term "2-one" indicates that there is a ketone functional group (C=O) at the second carbon. Place the double bond oxygen on carbon 2:
```
C1 - C2=O - C3 - C4 - C5
```

5. **Add the Methyl Group**:
- The "4-methyl" indicates that there is a methyl group (−CH3) attached to the fourth carbon. Add this group to carbon 4:
```
C1 - C2=O - C3 - C4(CH3) - C5
```

6. **Complete the Structure with Hydrogens**:
- Now, add hydrogen atoms to each carbon to satisfy the tetravalency of carbon (each carbon should form four bonds):
- C1 will have 3 H (CH3)
- C2 will have 1 H (due to the double bond with O)
- C3 will have 2 H (CH2)
- C4 will have 1 H (due to the methyl group)
- C5 will have 3 H (CH3)

7. **Final Structural Formula**:
- The complete structural formula can be represented as:
```
CH3 - C(=O) - CH2 - CH(CH3) - CH3
```

### Final Structural Formula:
```
O
||
CH3 - C - CH2 - CH - CH3
```