Give structure formula of 5-keto -2 methyl hexanal.

Explanation

To draw the structure formula of 5-keto-2-methylhexanal, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Parent Chain**:
- The name "hexanal" indicates that the parent chain consists of 6 carbon atoms. Therefore, we will start by drawing a straight chain of 6 carbon atoms.
- Structure:
```
C1 - C2 - C3 - C4 - C5 - C6
```

2. **Determine the Functional Groups**:
- The suffix "al" indicates the presence of an aldehyde group (-CHO) at the end of the carbon chain. Since we have a hexanal, the aldehyde group will be at carbon 1.
- Structure:
```
CHO - C2 - C3 - C4 - C5 - C6
```

3. **Add the Methyl Group**:
- The prefix "2-methyl" indicates that there is a methyl group (-CH3) attached to the second carbon.
- Structure:
```
CHO - C2(CH3) - C3 - C4 - C5 - C6
```

4. **Add the Keto Group**:
- The term "5-keto" indicates that there is a ketone group (C=O) at the fifth carbon.
- Structure:
```
CHO - C2(CH3) - C3 - C4 - C5(=O) - C6
```

5. **Complete the Structure**:
- Now, we need to add the necessary hydrogen atoms to satisfy the tetravalency of carbon.
- The complete structure will look like this:
```
CHO
|
CH3 - C2 - C3 - C4 - C(=O) - C6
|
H
```

### Final Structure:
The final structural formula of 5-keto-2-methylhexanal is:
```
O
||
CHO - C - C - C - CH3
|
CH3
```