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- 2. Identify the alkene that is the most stable and the alkene that is the least stable. ľº so Most stable= Explanation for most stable alkene: 11 III Least stable I4. The enthalpies, AH°, for the hydrogenation of three alkenes are shown below: Alkene A: -50 kcal/mole Alkene B: -60 kcal/mole Alkene C: -70 kcal/mole Which alkene is the least stable and why?Rank the following compounds from least to most stable. Least stable Most stable
- 4. The scheme below shows the reaction of a ketone, 2-propanone with methanol. ОН :0 : || CH;-C-CH3 : ОН + H - Н CH,-C-CH3 CH;-C-CH3 N step 1 step 2 step 3 P CH;OH CH3 CH;OH step 4 OCH, CH,-C-CH3 H - H,0 R CH;-C-CH3 step 7 step 6 step 5 OCH3 OCH; i) Write the missing structures (N, O, Q and R) in the above reaction scheme. ii) Name the class of compounds P and S belong to? iii) This is an acid catalyzed reaction. What does this statement mean? iv) Draw the arrow diagram in step 6 to show how intermediate R is formed? Write the equation for this step ONLY. v) Steps 3 and 7 involve loss of a proton from the intermediate ions. Why is this step necessary?Draw the alkene that would react with the reagent given to account for the product formed. ? + + H₂O **** H₂S04 • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. CH3 CH3 CHCCH3 | | OH CH3 +14. A student was asked to prepare an alkene X in high yield using any alcohol as starting material CH3 CH,-C -CH=CH, CH3 X He chose 3, 3-dimethylbutan-2-ol (XI) and carried out a dehydration reaction. He was however horrified to note that the only alkene obtained was XII. CH3 OH CH3 CH;-C=C-CH3 conc. H,SO4 CH-CH3 heat CH3 CH3 XI XII i) Explain what went wrong here, and why X could not be formed from 3, 3-dimethylbutan-2-ol. Use structures to help support your answer. ii) Give an equation to show a much better method for preparing X in high yield. 5. Analyze the following structure and write one combination for Grignard reagent and a carbonyl that would give rise to it. CH,-CH,-OH
- 17. Name the following alkynes. b. a H HーC三c- H-c=c- H H H. H d. H-cEc-CH,-CH3 -c=c- H- с—н H H .CH3 f. H2Ç .CH2 c-c=CH H3C. H H-C-H CH H-C C-C- -c- C-H CH3 H2C. H H Н-с-н CH2 H CH3 I-O- O-Match each alkene to its heat of hydrogenation.Alkenes: 3-methylbut-1-ene, 2-methylbut-1-ene, 2-methylbut-2-ene?H° (hydrogenation) kJ/mol: –119, –127, –112Which of the following options correctly describes the reaction shown (use the data provided to help answer the question)? + H-CI Bond dissociation energies secondary C-Cl: 81 kcal/mol secondary C-H: 95 kcal/mol alkene C=C pi bond: 65 kcal/mol H-CI: 103 kcal/mol secondary C-secondary C sigma bond: 83 kcal/mol The reaction is an addition and is exothermic by 8 kcal/mol The reaction is a substitution and is endothermic by 8 kcal/mol The reaction is a substitution and is exothermic by 8 kcal/mol The reaction is an addition and is endothermic by 8 kcal/mol