The reaction involves ozonolysis of an alkene, which cleaves the double bond to form carbonyl compounds. The given alkene has 7 carbon atoms. Ozonolysis breaks the C=C bond, converting each carbon of the double bond into a carbonyl group. The major products will be a ketone (from the trisubstituted carbon) and an aldehyde (from the disubstituted carbon). Counting the carbon atoms: the ketone has 4 carbons and the aldehyde has 3 carbons. The major product with more carbons is the ketone, which has 4 carbon atoms.

Final Answer: 4