- According to the question propanal and pentan-3-one are the ozonolysis products of

an alkene. Let the given alkene be ‘A’. Writing the reverse of the ozonolysis reaction, we get:-

The products are obtained on the cleavage of ozonide ‘X’. Hence, ‘X’ contains both products in the cyclic form. The possible structure of ozonide can be predicted as:-

Now, ‘X’ is an addition product of alkene ‘A’ with ozone. Hence, the possible structure of alkene ‘A’ is:-