An alkene give two moles of `HCHO`, one mole of `CO_(2)` and one mole of `CH_(3)-underset(O)underset(||)(C )-CHO` on ozonolysis. What is its structure ?

Options

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

Explanation

To determine the structure of the alkene that gives two moles of HCHO, one mole of CO2, and one mole of CH3C(=O)CHO upon ozonolysis, we can follow these steps:

### Step 1: Understand the Products of Ozonolysis
Ozonolysis of alkenes typically results in the cleavage of double bonds, leading to the formation of carbonyl compounds (aldehydes or ketones). In this case, we have:
- 2 moles of HCHO (formaldehyde)
- 1 mole of CO2 (carbon dioxide)
- 1 mole of CH3C(=O)CHO (which is an aldehyde)

### Step 2: Analyze the Given Products
From the products, we can infer:
- The presence of two moles of HCHO suggests that two carbon atoms are being oxidized to form formaldehyde.
- The formation of CO2 indicates that one of the carbon atoms in the alkene is completely oxidized, losing a carbon atom in the process.
- The CH3C(=O)CHO indicates that there is a carbon chain with a carbonyl group (C=O) and an aldehyde group (CHO).

### Step 3: Propose a Structure for the Alkene
Given the products, we can propose a structure for the alkene that can yield these products upon ozonolysis. A suitable candidate would be 2-pentene (CH3-CH=CH-CH2-CH3).

### Step 4: Perform Ozonolysis on the Proposed Structure
1. **Ozonolysis of 2-pentene**:
- The double bond between the second and third carbon atoms breaks.
- The resulting fragments would be:
- CH3C(=O)CHO (from the left side of the double bond)
- HCHO (from the right side of the double bond)
- CO2 (from the carbon that is oxidized completely)

### Step 5: Confirm the Products
- From the ozonolysis of 2-pentene, we get:
- 1 mole of CH3C(=O)CHO (which corresponds to the aldehyde)
- 2 moles of HCHO (from the two terminal carbons)
- 1 mole of CO2 (from the carbon that is oxidized)

### Conclusion
The structure of the alkene is **2-pentene** (CH3-CH=CH-CH2-CH3).

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