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

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(N/A) To find the alkene from its ozonolysis products,we remove the oxygen atoms from the carbonyl groups of the products and join the carbon atoms with a double bond.
Product $1$: Propanal $(CH_3-CH_2-CHO)$
Product $2$: Pentan-$3$-one $(CH_3-CH_2-C(=O)-CH_2-CH_3)$
Removing the oxygen atoms from the carbonyl groups $(C=O)$ and joining the carbons with a double bond $(C=C)$:
$CH_3-CH_2-CH=C(CH_2-CH_3)_2$
The structural formula of the alkene is $3$-ethylpent-$2$-ene,which is $CH_3-CH_2-CH=C(CH_2-CH_3)_2$.

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