1. Also called: first cousin, cousin-german or full cousin the child of one's aunt or uncle. 2. a relative who has descended from one of one's common ancestors. A person's second cousin is the child of one of his parents' first cousins. A person's third cousin is the child of one of his parents' second cousins. A first cousin once removed (or loosely second cousin) is the child of one's first cousin.
As a functional group, benzene and substituted benzenes are called arenes. Nomenclature: Functional group suffix = -benzene (review) Functional group prefix = phenyl-Substituted benzenes are usually named as such.The relative positions can be denoted as 1,2- = ortho-, 1,3- = meta-and 1,4- = para-substitution.When polysubstituted, the numbers alone are used, e.g. 1,2,3-trimethylbenzene.omenclature: Functional group suffix = -benzene (review) Functional group prefix = phenyl-Substituted benzenes are usually named as such. The relative positions can be denoted as 1,2- = ortho-, 1,3- = meta-and 1,4- = para-substitution. When polysubstituted, the numbers alone are used, e.g. 1,2,3-trimethylbenzene.
Alcohols are biomolecules that contain at least one hydroxyl group (RâOH). The simplest of all oxygen-containing functional groups, hydroxyl groups add polarity to organic molecules because of the strong electronegative nature of oxygen atoms.arboxyls. Although it may be confusing, carbonyl and carboxyl functional groups (RâCOOH) have similar names for a reason. A carboxyl group contains both a carbonyl group and a hydroxyl group, bonded to the same carbon atom. The name carboxyl derives from combining these two terms, carbonyl + hydroxyl = carboxyl.