Definition: Ethyl: A benzaldehyde compound found in several plants. Cetone: An organic compound with a carbon-carbon double bond between three or more atoms. Cyclohexane: A liquid chemical compound, typically produced by isomerization of benzene and oxygen. Hexane: A solid chemical compound that is colorless, odorless, and highly toxic. Iodine: A naturally occurring chemical element that exists in a number of compounds including iodides. Monoterpenoid: An aromatic compound with at least one double bond between the carbon atoms.