Answer the following question given this paragraph: A secondary alcohol forms a ketone when oxidized. The secondary alcohol cannot be further oxidized to produce a carboxylic acid. Tertiary alcohols cannot be oxidized in this way, because the carbon atom bonded to the OH group is not also bonded to any hydrogens. Q: What forms a ketone when oxidized? A:
Choices: i. enzyme ii. aldehyde iii. carbolic acid iv. secondary alcohol
iv.