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Arrange the following groups in order of
their preference of rearrangement.
-Arelektronarm, -Rtert, -Rprim, -H, –Arelektronryk, -Rsek
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- The following molecular model of a dimethyl-substituted biphenyl represents the lowest-energy conformation of the molecule. Why are the two benzene rings tilted at a 63� angle to each other rather than being in the same plane so that their p orbitals overlap? Why doesn't complete rotation around the single bond joining the two rings occur?Bicyclohexadiene, also known as Dewar benzene, is extremely stable despite the fact that its rearrangement to benzene is energetically favored. Explain why the rearrangement is so slow.Which of the following rings is the most strained? cyclopropene; cyclopropane; cyclobutane; cyclopentane; cyclohexane after finding the most strained compound explain why and compare it to the other answer choices, explaining why they do not work as an answer.
- Compounds P and Q can undergo a Diels-Alder reaction to form two regioisomeric products R and S as shown in Figure 5. OMe O C8H12O2 R C8H12O2 S Figure 5 Draw the chemical structures of regioisomeric compounds R and S. Using possible resonance contributors of P and Q predict which of the two regioisomers will be favoured in the reaction. Using curly arrows, draw the mechanism for the reaction of P and Q to form the dominant regioisomer you have predicted in your answer to part (ii) above.Choose the correct option. 1. Which of the following reactions best describes the Diels-Alder reaction?A)electrocyclic reactionB)cycloaddition reactionC)sigmatropic reactionD)radical reactionE)nucleophilic substitution reaction 2.Which of the following statements best describes the theory of Conservation of Orbital Symmetry?A)Molecular orbital of the transition state must be similar to that of the reactant.B)Molecular orbital of the transition state must be similar to that of the product.C)Only s orbitals from reactants and products are utilized.D)Molecular orbitals of reactant and product must have similar symmetry.E)Molecular orbitals of reactant and product must have different symmetry. 3.Through what type of single pericyclic reaction did the reaction proceed? 5-methylcyclopenta-1,3-diene to 1-methylcyclopenta-1,3-dieneA)[1,2] sigmatropic hydrogen migrationB)[1,3] sigmatropic hydrogen migrationC)[1,4] sigmatropic hydrogen migrationD)[1,5] sigmatropic hydrogen migrationE)none of the…Furan and maleimide undergo a Diels–Alder reaction at 25 °C to give the endo isomer of the product. When the reactiontakes place at 90 °C, however, the major product is the exo isomer. Further study shows that the endo isomer of theproduct isomerizes to the exo isomer at 90 °C.furan: O maleimide:OON H(a) Draw and label the endo and exo isomers of the Diels–Alder adduct of furan and maleimide.(b) Which isomer of the product would you usually expect from this reaction? Explain why this isomer is usually favored.(c) Examine your answer to (b) and determine whether this answer applies to a reaction that is kinetically controlled orone that is thermodynamically controlled, or both.(d) Explain why the endo isomer predominates when the reaction takes place at 25 °C and why the exo isomer predominates at 90 °C
- y Bookmarks Profiles Tab Window Help ALEKS - Tiffany Te-L-Peng - L X + s.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-liGBdp5ulp5VqUnMDyPOVaX6q0CRPLZSQ5NDhtwNMJjUNcq = O SUBSTITUTION REACTIONS Predicting the effect of carbocation stability on the rate of... For each pair of substrates below, choose the one that will react faster in a substitution reaction, assuming that: 1. the rate law for the substitution reaction has a first-order dependence on the concentration of the alkyl halide, and 2. doesn't depend on the concentration of the other reactant at all. Explanation. Substrate A Br Check Substrate B B CI Xa Faster Rate (Choose one) (Choose one) (Choose one) ▼ ▼Rank the following from highest to lowest priority aссording to the Cahn-Ingold-Prelog system: -CH2CHЗ, -СНCH2, -ССH, -СНз- -CCH, -CH3, -CH2CH3, -CHCH2 -CH3, -CH2CH3, -CHCH2, -CCH O -CCH, -CHCH2, -CH2CH3, -CH3 O - CH3, -CH2CH3, -CCH, -CHCH27. At room temperature cyclopentadiene reacts with itself to form dicyclopentadiene in a Diels-Alder reaction. a) draw the self reaction of cyclopentadiene 20°C. b) When dicyclopentadiene is heated to boiling (170°C), the retor-Diels-Alder reaction occurs producing 2 moles of cyclopentadiene. Explain this observation in terms of free energy, enthalpy and entropy. c) If the AHxn = -75 kJ/mol and the ASpxn = -226 J/mol K, What temperature would be required for the reaction to be at equilibrium (Keq = 1).
- Fundamentals. 1. Complete each part below. s fo olad irroda anonaen Isoiatedo owi ar to das nl (i i) Identify both the C/H types (1°, 2°, 3°, 4° or NA) on the molecule below: ar ord boa stibomo S-CH3 CH3 CH3 H3C-C▬▬CH2-CH-CH,-CH- CH3 CHз-CH2rank leaving group abililty: Cl, MeCO2, Me, NMe2, OHWhat is the main difference between an aromatic and an anti-aromatic compound? O None of these O Aromatic compounds must satisfy Hückel's rule. O Anti-aromatic compounds must have a conjugated system with a p orbital at every vertex. O Aromatic compounds must be cyclic and planar but not anti-aromatic compounds. O Aromatic compounds must be monocyclic.
