Question

Chapter Review 177 481 Are the following compounds structural isomers, cis-trans isomers, or enantiomers? 4.82 Draw the enantiomer of each of the following com- pounds. If the compound is not chiral, state that fact. a. H Η and b. HO Find Br" CH, MF HC Br b. Br но Br. OH w and b. H H-C-H HH H-C-C-C- H C H,CH(CH), c. Che Problems 4.83 Cartat omega-3 fatty acids can be found only in animal sources, such as fatty fish. Two of these are cosapentaenoic acid (EPA) [20:5] and docosa- hexaenoic acid (DHA) (22:6), both of which are w-3 fatty acids. DHA has been shown to be important in healthy brain development, so it has recently been added to infant formulas. Breast milk is rich in DHA as long as the mother maintains a healthy diet that includes fish. Draw skeletal structures of the fatty acids EPA and DHA. 4.84 For each pair of molecules, identify the pair as: A. structural isomers. B. the same molecule (conformational isomers). C. cis-trans stereoisomers. D. different molecules. H H H H I H-C-C-C-C-H Η H-C-H H H H H H e. CHỊCH,CH,CH,OH

4.81,4.82

Answer 1

Encuntiamer - Pairal chiral molecules which are nan. seeper imposable miserar images at ane another Structural isamer - Molecules with same molecular farmu. -la, but the banting patterns and atamie arganizatian is different. Cis ar transisamer - cis,frans isameris on aho known as the geometrie isamerison is basically When, the graceps of same priority is un the same side af Cartan chain then eis; but if they are at the appasit side of the Carban chain then trans. H-81) a) H@ } 2 Friul o There two molecule has ane chiral Center, that is the Central molecule o They are han superimpasable miverar image an each other o One is s and the otherancis R canteiguratian. Hence is chantiamer to è ach other. os enantiamers Br and Struletural isamers o Bothe al them have same molecular farmula es Hg O Br o But their banding pattern and arganizatians of atams are dei Seferent.. o so they are structural is amors o Bothar them have saime molecular Parmula , e5H12. . But there banting partern and alami arganizalians are different o so they are structural isamers Structural isainers

4.82 - chiral center a Carrespanding Chantiamer s o anticlockwire vaatiain o lowest priority group below the plane PR o Cloekweine ratarian o lawent priority graup below the plane 6) OH - The molecule has no chiral center and hence have no chauntiamer. NH, o chiral ecenter NH2O ZH @ Corresponding chauntianer I112 ndring o cloekwise ratation o Highest priority grecep below the plane o anticlock wise ratatiar o fighest priority group below the plane.