Special information- Functional GroupsWhen an organic compounds contain two or more functional groups, one is called principle functional group while the others are called the secondary functional groups and treated as substituents:The order of preference for principal group:-NoFamily [Functional Groups]NoFamily [Functional Groups]

1Carboxylic acid [carboxyl]7Aldehydes [carbonyl]

2Acid Anhydrides8Ketones

3Esters [carbonylalcoxyl]9Alcohols

4Acid halides10Amines

5Amides 11 Alkene [Double bond]

6Nitrites12Alkyne [Triple bond]