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Linear polyenes on ozonolysis gives two ...

Linear polyenes on ozonolysis gives two moles of acetaldehyde and one mole of propanedinal. Linear polyene will be

A

Alkadiene

B

Alkatriene

C

Alkatetraene

D

Alkapentaene

Text Solution

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The correct Answer is:
To determine the linear polyene that gives two moles of acetaldehyde (CH3CHO) and one mole of propanedial (CHOCH2CHO) upon ozonolysis, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Products:** - The products of ozonolysis are given as: - 2 moles of acetaldehyde (CH3CHO) - 1 mole of propanedial (CHOCH2CHO) 2. **Understanding Ozonolysis:** - Ozonolysis involves the cleavage of double bonds in alkenes or polyenes in the presence of ozone (O3), leading to the formation of carbonyl compounds (aldehydes or ketones). 3. **Determine the Structure of the Polyene:** - Since we have two moles of acetaldehyde, it indicates that two double bonds in the polyene must be cleaved to yield two acetaldehyde molecules. - The presence of one mole of propanedial indicates that one double bond must yield this compound. 4. **Construct the Linear Polyene:** - To satisfy the products, we can start constructing the linear polyene: - The simplest structure that can give two acetaldehyde and one propanedial is: \[ CH3-CH=CH-CH=CHO \] - This structure has two double bonds and is a linear polyene. 5. **Verification:** - When ozonolysis occurs: - The first double bond (between the first and second carbon) will yield one mole of acetaldehyde (CH3CHO). - The second double bond (between the third and fourth carbon) will yield another mole of acetaldehyde (CH3CHO). - The remaining carbon chain will yield propanedial (CHOCH2CHO) from the cleavage. 6. **Conclusion:** - The linear polyene that corresponds to the given ozonolysis products is: \[ CH3-CH=CH-CH=CHO \] - This structure is a linear diene, confirming that it belongs to the family of alkyl dienes. ### Final Answer: The linear polyene is \( CH3-CH=CH-CH=CHO \).
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