Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Ketones are carbonyls in which the carbon atom makes single bonds with two other carbon atoms. Ketones are less reactive than aldehydes and are a common component in nail polish removers and paint strippers. Answer: ketones
What word describes a carbonyl where the carbon atom makes single bonds with two others?