Among the following , the alkene on ozonolysis giving rise to only one aldehyde as the product , is

Options

A. 1-butene
B. propene
C. 2-butene
D. 2-methylprop-1-ene

Answer

To solve the problem of identifying which alkene gives only one aldehyde product upon ozonolysis, we can analyze the options provided in the question.

### Step-by-Step Solution:

1. **Understanding 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 the resulting fragments are oxidized to form carbonyls.

2. **Analyzing the Options**: We need to evaluate each alkene option to see how many different aldehyde products are formed after ozonolysis.

3. **Option 1: 1-Butene (CH₃-CH₂-CH=CH₂)**:
- Structure: CH₃-CH₂-CH=CH₂
- Ozonolysis Reaction:
- Cleavage of the double bond yields CH₃-CHO (butanal) and HCHO (formaldehyde).
- Products: Two different aldehydes (butanal and formaldehyde).

4. **Option 2: Propene (CH₃-CH=CH₂)**:
- Structure: CH₃-CH=CH₂
- Ozonolysis Reaction:
- Cleavage of the double bond yields CH₃-CHO (acetaldehyde) and HCHO (formaldehyde).
- Products: Two different aldehydes (acetaldehyde and formaldehyde).

5. **Option 3: 2-Butene (CH₃-CH=CH-CH₃)**:
- Structure: CH₃-CH=CH-CH₃
- Ozonolysis Reaction:
- Cleavage of the double bond yields CH₃-CHO (acetaldehyde) and CH₃-CHO (acetaldehyde).
- Products: Only one type of aldehyde (acetaldehyde).

6. **Conclusion**: Among the given options, 2-butene is the alkene that gives rise to only one aldehyde product upon ozonolysis.

### Final Answer:
The alkene that gives only one aldehyde as the product upon ozonolysis is **2-butene (CH₃-CH=CH-CH₃)**.