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- Match the reaction with the mechanism that it proceeds through. HO, HO. X catalytic H₂SO4 HBr Br₂ light 1. Free Radical Chain Reaction 2. SN1 3. SN2 4. E1 5. E219. Which of the following radical intermediates is the least stable? A. methane radical B. primary radical C. secondary radical D. tertiary radical 20. Compound J undergoes a carbonium ion rearrangement to yield compounds K and L. Based on the potential energy diagram below which of the following statements is TRUE. Potential energy A. K is formed faster and is more stable than L. B. K is formed faster and is less stable than L C. L is formed faster and is less stable than K L Reaction coordinate 21. Which of the following is the expected major product for the reaction below. 000 000 00-50 D. L is formed faster and is more stable than K D.a.What carbon radical is formed by homolysis of the C–Ha bond in propylbenzene? Draw all reasonable resonance structures for this radical. b.What carbon radical is formed by homolysis of the C–Hb bond in propylbenzene? Draw all reasonable resonance structures for this radical. c. The bond dissociation energy of one of the C–H bonds is considerably less than the bond dissociation energy of the other. Which C–H bond is weaker? Offer an explanation.
- A -if the indicated property/behavior in item I is greater than in item II B-if the indicated property/behavior in item I is less than in item II. C- if the indicated property/behavior is equal in item I and item II. D- if the indicated data is insufficient to make a comparison.1. Which among these would be the most stable carbocation?a. Allylicb. Vinylicc. Primaryd. Secondary2. What is the primary reason for the stability of tertiary carbocations?a. Free rotationb. Resonancec. Hyperconjugation9. Draw the transition state for the following SN2 reaction. (please see attached screenshot). A. I B. II C. III D. IV
- Photobromination reaction (Br₂/hv) is not particularly selective, minor structural isomeric products are also formed in addition to the major product. A. Assuming substitution of H for Br occurs at every possible kind of hydrogen atom (substitute only 1 H atom), draw all the isomeric product(s) can be formed for the two structures shown below. B. Indicate the major product in each case. C. Draw the critical radical intermediates that are involved in formation of the major product. x A B6. Select the incorrect statement conceming the reaction you conducted during the isomerization experiment. Choose one. H,CO. Brz, light H,CO. rOCH rOCH methylene chioride dimethyl maleate dimethyl fumarate A. The major intermediate formed during the reaction contains both a bromine atom and a radical. B. Bromine is added catalytically instead of stoichiometrically because the bromine radical is regenerated when the product is formed. C. After twenty minutes, the reaction mixture contained both reactant and product. D. Both reactant and product are soluble in methylene chloride. E. If the reaction mixture turned colorless, that was an indication that the bromine radicals were consumed. F. When cold hexanes was added, only dimethyl fumarate precipitated out of solution because dimethyl maleate is soluble in cold hexanes.H₂C CH₂ 2 c CH₂ 1. Reaction A is a radical process. The part of the mechanism that is represented above is called [blank1] would immediately follow [blank2] A. a. nucleophilic attack; hydrogen abstraction b. homolytic attack; hydrogen abstraction c. hydrogen abstraction; homolytic cleavage d. nucleophilic attack; homolytic cleavage 2. Radical mechanisms begins by which of the following events: a) homolytic cleavage b) heterolytic cleavage c) extreme heating or exposure to light irradiation. d) nucleophilic attack 3. Rank the following radicals from most stable to least stable: CH H₂C A CH₂ a) D > C>A>B b) B>D>A>C c) D> B>A>C d) C>A>B>D H₂C B CH₂ H₂C" CH₂ C CH3 H₂C CH D CH₂
- Which radical would be the most stable out of the following? A. С. В. D.4. Why are most radical reactions considered "propagation" steps?09:19 ull 4G Which factors affect the reaction rate in Diels-Alder reactions? OA. Electron.donating group on the diene and electron withdrawing group on dienophile. O B. Electron donating group on both the diene and the dienophile. OC. Electron withdrawing group on both the diene and the dienophile. O D. Addition of catalyst. Add a caption... > Status (Custom)