Structure Name w us sy 2,3,3-trimethylhexane 2,3-dimethylpentane 4-ethyl-2,3-dimethylheptane 4-ethyl-2,5,6-trimethyloctane 3,4,5-trimethyloctane Part Two: Functional Groups Structure Functional Group Structure Functional Group O i R R SH C R 20 H IZ R O=0 R 20 . R R O=0 0 R R O Part Three: Functional Groups in Molecules Molecule Functional Groups Present 'N OH HO OH NH2 N OH . HO OH NH2 N 0 0 H N HN T R R 0 SH