What happens to double bonds during the oxidation reaction of alkenes?

During the oxidation reaction of alkenes, double bonds are indeed removed. Alkenes, which contain one or more carbon-carbon double bonds, can undergo oxidation to form other types of compounds, often alcohols, ketones, or carboxylic acids, depending on the conditions and reagents used in the reaction.

When an alkene is oxidized, the π bond of the double bond is broken, and new bonds are formed, typically involving the addition of oxygen or the conversion of the alkene into a more oxidized functional group. For example, when an alkene is treated with potassium permanganate (KMnO4) or ozone (O3), the double bond is converted into a more oxidized functional group, effectively removing the double bond in the process.

In the context of the other options, no new double bonds are formed during this reaction, and the formation of cyclic structures does not generally occur through simple oxidation of alkenes. The focus is on the transformation and subsequent bond formation that leads to the removal of the double bond.