A. Cyclopentanone
B. Cyclohexanol
C. Hexanal
D. Butanal
Answer: Cyclopentanone
A. Cyclopentanone
B. Cyclohexanol
C. Hexanal
D. Butanal
Answer: Cyclopentanone
Additional Information: Cyclopentanone is a cyclic ketone, while the others are either straight-chain aldehydes or alcohols.