Table 2.5 Physical Properties of Some Unbranched Alkanes Condensed Structural Formula Melting Point (°C) Boiling Point Density of Liquid* (g/mL at 0°C) Name (°C) Methane CHA -182 -164 (a gas) Ethane CH,CH, -183 -88 (a gas) Propane CH,CH,CH, -190 -42 (a gas) CH,(CH,),CH, CH,(CH,),CH, Butane -138 (a gas) Pentane -130 36 0.626 Нехane CH,(CH,),CH, -95 69 0.659 Неptane CH,(CH,),CH, CH,(CH,),CH, -90 98 0.684 Octane -57 126 0.703 Nonane CH,(CH,),CH, -51 151 0.718 Decane CH,(CH,),CH, -30 174 0.730

For each molecule, draw the structure and indicate whether cis/trans isomers are possible. If they do, draw them both and label them as cis and trans. a. 2-methyl-1-butene b.1,2-dimethylcyclohexane

For a simple distillation, explain: a) what is the observed effect that chain length has on their boiling points? Explain why this trend is observed. b) compare the boiling points of the branched alkanes to that of hexane. what is the observed effect of branching on boiling points? explain why this trend is observed

Consider alkene 3. alkene 3 name: CH2 H2C C. In CH2 H3C