Question:
Which of the following alkenes forms formaldehyde and acetaldehyde on ozonolysis?
Which of the following alkenes forms formaldehyde and acetaldehyde on ozonolysis?
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Join the carbonyl carbons of the two aldehydes by a double bond to rebuild the alkene.
Updated On: Nov 12, 2026
- Ethene
- Propene
- But-2-ene
- But-1-ene
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Ozonolysis breaks the C=C bond and each doubly bonded carbon becomes a C=O group.
Step 2: Rebuild the alkene
Join the carbonyl carbon of HCHO with that of \(\text{CH}_{3}\text{CHO}\) by a double bond to get \(\text{CH}_{2}=\text{CH-CH}_{3}\).
Step 3: Check the others
Ethene gives only HCHO, but-2-ene gives only \(\text{CH}_{3}\text{CHO}\), and but-1-ene gives HCHO and propanal.
Final Answer:
The alkene is propene. \[ \boxed{\text{(B) }\text{Propene}} \]
Ozonolysis breaks the C=C bond and each doubly bonded carbon becomes a C=O group.
Step 2: Rebuild the alkene
Join the carbonyl carbon of HCHO with that of \(\text{CH}_{3}\text{CHO}\) by a double bond to get \(\text{CH}_{2}=\text{CH-CH}_{3}\).
Step 3: Check the others
Ethene gives only HCHO, but-2-ene gives only \(\text{CH}_{3}\text{CHO}\), and but-1-ene gives HCHO and propanal.
Final Answer:
The alkene is propene. \[ \boxed{\text{(B) }\text{Propene}} \]
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