2. The parent chain selected must conta in the carbonyl gro 3. Number the carbon chain, beginning at the end nearest to the carbonyl group 4. Number the substituents and write the name, listing substituents alpha betically 3-cyclohexenone O? 3-nitrobenzaldehyde 2-hexan 4-hexen-2-one When an aldehyde is a substituent on a ring, it is referred to as a- carbaldehyde group Cyclohexanecarbaldehyde Benzenecarbaldehyde ( Benzaldehyde 6. When the-COR group becomes a substituent on another chain, it is referred to as an acyl group and the name is formed using the suffix -yl Acetyl 7. When the carbonyl group becomes a substituent on another chain, it is referred to as an oxo group 5-oxohexanal2. The parent chain selected must contain the carbonyl group. 3. Number the carbon chain, beginning at the end nearest to the carbonyl group. 4. Number the substituents and write the name, listing substituents alphabetically. 5. When an aldehyde is a substituent on a ring, it is referred to as a -carbaldehyde group. 6. When the -COR group becomes a substituent on another chain, it is referred to as an acyl group and the name is formed using the suffix -yl. 7. When the carbonyl group becomes a substituent on another chain, it is referred to as an oxo group