Most reactions with sugars are carried out in a neutral or acidic medium. If instead of a neutral or acidic medium, an alkaline medium is used to carry out the reaction then the sugar will undergo a/an _ reaction.

Explanation

When sugars are exposed to alkaline conditions, especially when heated, reducing sugars can be oxidized. This involves the formation of enediols, which are intermediates that can further oxidize, transforming aldehyde or ketone groups into carboxylic acids. This is different from hydrolysis, which requires acidic conditions to break down sugars, and addition reactions, which involve forming larger molecules like starch from glucose units. Inversion is also not applicable here, as it requires acid for sucrose to split into glucose and fructose. Therefore, the correct answer is oxidation.