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.
Thnaks :). Benzene and phenyl seems look the same because they are both aromatic and all aromatic compounds are based on benzene C6H6. Phenyl or phenyl functional group is a hydrocarbon derived from benzene by removing 1 H, making it a C6H5 then attaching it to something else. Phenyl is a group.henyl or phenyl functional group is a hydrocarbon derived from benzene by removing 1 H, making it a C6H5 then attaching it to something else.-Phenyl is a group. Typically a subsituent if you are naming organic compounds.