A. What alkene would give only a ketone with three carbons...

Key Concepts

Oxidative Cleavage of Alkenes

This concept involves breaking the carbon–carbon double bond in alkenes using an oxidizing agent (such as ozone during ozonolysis or potassium permanganate). The reaction cleaves the alkene into two separate carbonyl groups, typically yielding aldehydes, ketones, or acids depending on the alkene's substitution pattern. Understanding this concept is key to predicting which carbonyl products will be formed from a given alkene.

Ozonolysis Reaction Mechanism

Ozonolysis is a specific type of oxidative cleavage where ozone reacts with the alkene to form a molozonide intermediate, which rearranges and ultimately decomposes to yield carbonyl compounds. The mechanism explains how the number and types of substituents around the original double bond determine whether aldehydes or ketones are produced. This mechanistic insight is crucial for understanding how the cleavage of a specific alkene leads to products with defined carbon counts.

Structure–Product Relationship in Alkene Cleavage

The structure of the starting alkene, including the placement and nature of substituents on the double bond, governs the distribution of carbon atoms in the resulting fragments after oxidative cleavage. For instance, symmetrical alkenes typically yield two identical carbonyl compounds, whereas unsymmetrical alkenes yield different products. Mastery of this relationship is essential for designing and predicting outcomes in oxidative cleavage reactions.

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