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- The compound below is treated with chlorine in the presence of light. H3C CH3 H3C° `CH2CH3 Draw the structure for the organic radical species produced by reaction of the compound with a chlorine atom. Assume reaction occurs at the weakest C-H bond. • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms.H3C CH3 H3C NA C→XT Br Br₂ CH₂Cl₂ H3C Electrophilic addition of bromine, Br₂, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH₂Cl₂. CH3 Br In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the bromonium ion so that a product with anti stereochemistry is formed. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions Br CH3 H3C CH310) For the reaction between isopropyl 1-propyl (or 'n-propyl') ether and HBr, which type of reaction best matches the expected products? A) Acid-catalyzed dehydration B) Nucleophilic substitution reaction C) Ether cleavage reaction D) Nucleophilic addition-elimination reaction
- Which represents an efficient synthetic route to go from an alkane to an alkene? O elimination with NaNH2, followed by a water workup O anti-Markovnikov hydrohalogenation, followed by elimination O radical bromination, followed by elimination O hydration, followed by elimination O hydration, followed by ozonolysis of the double bondIn nucleophilic aromatic substitution reactions that proceed by the nucleophilic addition-elimination mechanism, the reaction rate increases as the electronegativity of the halogen leaving group increases: Ar-I < Ar-Br < Ar-CI < Ar-F. Which step does this suggest is the rate-determining step of the mechanism-the addition step or the elimination step? Explain.5. a) Determine the major product that is formed when the alkyl halide reacts with a hydroxide ion in an elimination reaction. CH,CH,CH,CH,CCH, Br b) For the major elimination product obtained in 5a), which stereoisonmer (cis or trans) is obtained in greater yield? Draw the two isomers and provide the names of the compounds.
- Vhich of the following statements is incorrect? * 3 p Hammond-Leffler Postulate states that there is a strong resemblance between the transition state and the product in an endothermic reaction. Hammond-Leffler Postulate states that there is a strong resemblance between the transition state and the reactants in an exothermic reaction. The presence of more electron-donating alkyl groups ineffectively delocalize the positive charge in an organic molecule, making it less stable. The dehydration of primary alcohol proceeds via E2 mechanism. All of the abovę5. a) Determine the major product that is formed when the alkyl halide reacts with a hydroxide ion in an elimination reaction. CH;CH,CH,CH,CCH, Br b) For the major elimination product obtained in 5a), which stereoisomer (cis or trans) is obtained in greater yield? Draw the two isomers and provide the names of the compounds.CCH H20, H2SO4 H9SO4 CH3 Alkynes do not react directly with aqueous acid as do alkenes, but will do so in the presence of mercury(II) sulfate as a Lewis acid catalyst. The reaction occurs with Markovnikov regiochemistry, so the OH group adds to the more highly substituted carbon and the H adds to the less highly substituted carbon. The initial product of the reaction is a vinyl alcohol, also called an enol. The enol immediately rearranges to a more stable ketone via tautomerization. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions Hjö: -CH3 -CH3 H3O*
- 2. The following carbocation is generated as an intermediate in the addition of H-Br to an alkene. Draw the structure of all possible alkenes that could have formed this intermediate.What happens when bromine attacks CH2 = CH – CH2 – C ≡ CH9. Hydrates, in which two -OH groups are connected to the same carbon, are not favorable except in a few cases. One case is: a) acetaldehyde c) acetone b) formaldehyde d) chloroform 10. The Wolff-Kishner reaction, in which an aldehyde or ketone is treated with NH2NH2 and KOH, is: a) an oxidation c) an SN2 reaction b) a reduction d) a hydration 11. Which of these is most likely to dissolve in 5% NaOH? a) 1-decanol b) decanal c) decanoic acid d) 2-decanone bu itcolf Draw tbe