What reaction occurs when using hot and concentrated potassium manganate solution on alkenes?

When hot and concentrated potassium manganate solution is reacted with alkenes, oxidation occurs, resulting in the formation of carbonyl compounds such as ketones or carboxylic acids, depending on the specific structure of the alkene. In this reaction, the double bond in the alkene is attacked by the permanganate ion, leading to the addition of oxygen atoms across the double bond and breaking it.

If the alkene is symmetrical or its substituents are such that the oxidation leads to the formation of ketones, then the products will be ketones. If the alkene has a terminal structure (where one of the double-bonded carbon atoms is bonded to a hydrogen), the oxidation can lead to carboxylic acids. This versatility in products based on the structure of the starting alkene makes the reaction particularly significant in organic synthesis. Thus, this option accurately describes the expected outcome of the reaction with potassium manganate.