STUDY GUIDE

5. An aliphatic hydrocarbon has molecular formula C 5 H 10 . T/I C(a) Draw all possible non-cyclic structural isomers of the compound. Writethe name of each structure.Learning TipRemembering Cis and TransTo use cis and trans correctly, youcould think of cis as being likesisters: side by side. And trans means“across,” as in transatlantic.Learning Tip(b) Identify if any of the structures in part (a) have stereoisomers. Draw andname the cis and trans isomers of the compound.Stereoisomers vs. StructuralIsomersStructural isomers have the samemolecular formula—the samenumbers and types of atoms, butwith the atoms bonded in differentways. Stereoisomers are identicalin their structural formulas, but thearrangement of the atoms or groupsin space around two carbon atomsdo not allow these atoms or groupsto be rotated to change from oneisomer to the other. Cis/trans isomersare common for alkenes, as theirmolecules cannot rotate around thedouble bond.6. Draw the cis and trans isomers of the following compounds. K/U C(a) 3-chlorohex-3-ene(b) 1,2-dimethylcyclobut-1-eneNEL1.2 Alkenes and Alkynes 7