Propanal-1 and pentan-3-one are the ozonolysis products of an alkene. What is th structural formula of alkene?

Options

A. `CH_(3)CH_(2)-underset(CH_(2)CH_(3))underset(|)(C)=CH-CH_(2)CH_(3)`
B. `CH_(3)CH_(2)-CH=CH-overset(CH_(2)CH_(3))overset(|)(C)H-CH_(3)`
C. `CH_(3)-underset(CH_(2)CH_(3))underset(|)(C)=overset(CH_(2)CH_(3))overset(|)(C)-CH_(3)`
D. `CH_(3)CH_(2)CH_(2)CH_(2)-CH=CH-CH_(2)CH_(3)`

Explanation

To determine the structural formula of the alkene that yields propanal-1 and pentan-3-one as products of ozonolysis, we can follow these steps:

### Step 1: Understand Ozonolysis
Ozonolysis is a reaction where alkenes react with ozone (O3) to form carbonyl compounds (aldehydes or ketones). The double bond in the alkene is cleaved, and oxygen is added to the resulting fragments.

### Step 2: Identify the Products
The products given are:
- Propanal-1 (an aldehyde, CH3CH2CHO)
- Pentan-3-one (a ketone, CH3C(=O)CH2CH2CH3)

### Step 3: Determine the Structure of the Alkene
To find the alkene that produces these two carbonyl compounds, we need to consider how the double bond in the alkene can lead to these specific products upon ozonolysis.

1. **Propanal-1** indicates that one fragment must be a 3-carbon chain with a terminal aldehyde group.
2. **Pentan-3-one** indicates that the other fragment must be a 5-carbon chain with a ketone at the 3rd position.

### Step 4: Construct the Alkene
To produce these products, we can start with a 5-carbon alkene. The double bond should be positioned such that when cleaved, it yields the two specified products.

- Consider the alkene 3-hexene (CH3-CH=CH-CH2-CH2-CH3):
- Upon ozonolysis, this alkene will break to yield:
- From the left side of the double bond: CH3-CH2-CHO (propanal-1)
- From the right side of the double bond: CH3-C(=O)-CH2-CH2-CH3 (pentan-3-one)

### Step 5: Finalize the Structural Formula
Thus, the structural formula of the alkene that gives propanal-1 and pentan-3-one upon ozonolysis is:

**Structural Formula: CH3-CH=CH-CH2-CH2-CH3 (3-hexene)**