Final answer:
The reaction transforming cyclohexanol into cyclohexanone is an oxidation reaction, as it involves the loss of hydrogen from the alcohol group forming a ketone.
Step-by-step explanation:
The conversion of cyclohexanol into cyclohexanone is considered an oxidation reaction because it involves the removal of hydrogen (or the addition of oxygen) from the substrate, which increases the oxidation state of carbon. During this process, cyclohexanol (which has an alcohol group) is oxidized to form cyclohexanone (which has a ketone group). According to general oxidation and reduction reactions in organic chemistry, the removal of hydrogen or addition of oxygen indicates an oxidation reaction.