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- Rank the following compounds from least to most stable. Least stable Most stable2. 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 alkenes below from most stable to least stable.● Rank the following alkenes from most to least stable. A 11 B ||| MacBook Air C IV4. 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 +117. 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-Which 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
- 4. 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,-OHMatch 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, –112Draw an expanded structural formula of pent-1-en-3-yne/ CH3-CC-CH=CH2 and then label each carbon. Indicate the longest and shortest C-H bond and predict the C—C single bond that has the highest BDE(bond dissociation energy).