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Which compound serves as the starting material in the reaction sequence involving ozonolysis followed by reduction with zinc and water to yield methanal and another product?

1. CH2=CH-CH2
2. Reaction with O3
3. Reduction with Zn and H2O
4. CH2-C-H (Methanal)

Correct answer: CH2=CH-CH2

Solution

The given reaction is ozonolysis of propene, which breaks the double bond to form methanal and ethanal. The reactant is CH2=CH-CH2, which matches option A.

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