text: The oxo process adds one of these functional groups to a double bond.
full_question: The oxo process adds one of these functional groups to a double bond. Because pyridinium chlorochromate is milder than the Jones reagent, it will always result in one of these functional groups when reacting with an alcohol. A common method for protecting this group forms a cyclic acetal upon reaction with ethylene glycol. Reaction of one of these functional groups with a triphenyl phosphonium ylide forms an alkene in the Wittig reaction. The slightly positive carbon found in this functional group makes an excellent target for nucleophilic attack, and is the typical target of Grignard reagents, which form alcohols from these function groups. For 10 points, name this functional group present in aldehydes and ketones, which consists of a carbon double bonded to an oxygen.
first_sentence: The oxo process adds one of these functional groups to a double bond.