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PART B. SHAPES OF ALKENES AND ALKYNES 1. Describe differences in shape between pentane, cis-2-pentene, trans-2-pentene and 2-pentyne. 2. Is it possible to make a trans- and a cis-cyclooctene molecule? What about cyclohexene? 4. What effert does the second double bond in cis-1,3-pentadiene have on the geometry of tie molecule? Compare it to 2-pentene. PART C. EXERCISES 1. Name the following compounds. 2. Given the names below, daw struetures for these unsaturated hydrocarbons. 2-hexyne diethylbenzene cis-4-octyne methyleyclopentene 3. Give the structure of the major organic product in each of the following reactions. Unsaturated Hydrocarbons