What are the reagents and solvents necessary for the transformation shown in the synthetic pathway below (place the reagents and solvents next to their corresponding letter below)? H он Br A B HO, CH3 CH3 CH2OH MgBr E CH3 CH3 A = B = C3= D = E =
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- 7. Choose the best reagent from the list below for carrying out each transformation. Place the letter of the reagent in the blank to the left of the reaction. (see attached screenshot). a. 1. O3 2. Zn, H3O+ b. 1. BH3, THF 2. H2O2, NaOH, H2O c. H2O, H2SO4, heat d. 1. OsO4 2. NaHSO3, H2O e. KMnO4, acid f. 1. Hg(OAc)2, H2O 2. NaBH4[VI1] Instructions: Provide the missing reagent/s, substrate/s, or product/s for each reaction. (refer to the photo below)1. Which of the following is the strongest nucleophile? Refer to the diagram below with an MeOH, MeSH, etc. 2. Which of the following is true about the stereochemistry of SN1 reaction?a.retention of configuration at the electrophilic centerb.50:50 mixture of retention and inversion of configuration at the electrophilic centerc.inversion of configuration at the electrophilic centerd. slightly more inversion than retention at the electrophilic center
- thanks. multiple choice: 1. Which of the following is true regarding an SN1 reaction? a. It would be faster at 25 ̊ than 50 ̊ b. It would be faster in ethanol than in pentane c. Keeping the moles of reactants constant but doubling the quantity of solvent would decrease the rate by a factor of 4. d. Stereochemical inversion occurs exclusively 2. Which of the following statements is true? a. The rate determining step is always the last step in a reaction mechanism. b. The stability/reactivity principle says that the more stable of two chemicals will be more reactive c. The reactivity/selectivity principle says that the more reactive of two chemicals will be less selective. d. The activation barrier for a reaction is the difference in energy between reactants and final products. 3. Which of the following statements is FALSE? a. Optically active solutions always contain chiral molecules. b. Two diastereomers always have identical melting points c. Optically…What is the major product after aqueous work up?20. (a) Show all steps in the synthesis of 2-pentene from 2-bromopentane. Show the structure of all reactants and product. CH3CHBrCH2CH2CH3 -------> CH3CH=CHCH2CH3 (b) Correctly identify the mechanism in (a) above(SN2, SN1, E2, E1)
- Which compound is not a possible product in the reaction below ( F2 is in excess F2and UV light the catalyst).CHA + F2 -->O CFAO CHFaO CHF-O CH2F2O CHaFIn each reaction box, place the best reagent and conditions from the list below. (A reagent may be used more than once.) Hint: step 1 is conducted at –78 °C.Match the questions with the correct descriptions below: Sn2, E2 E1cb Sn1, E1 (anti) E2, E1cb Sn1, E1 2 steps poor leaving group 2 carbons removed from a carbonyl group carbanion intermediate 3°>allylic, benzylic>2°>1°>CH₃ carbocation intermediate Ist order reaction (r=k[RX]) H-X anti no intermediate 2nd order reaction (r=k[RX][Nu]) polar aprotic solvent
- Which mechanism gave the main product in the reaction shown in Figure 8? * A- SN1 B- SN2 C- E1 D- E2For which reaction mechanisms—SN1, SN2, E1, or E2—are each of the following statements true? A statement may be true for one or more mechanisms.a. The mechanism involves carbocation intermediates.b. The mechanism has two steps.c. The reaction rate increases with better leaving groups.d. The reaction rate increases when the solvent is changed from CH3OH to (CH3)2SO.e. The reaction rate depends on the concentration of the alkyl halide only.f. The mechanism is concerted.g. The reaction of CH3CH2Br with NaOH occurs by this mechanism.h. Racemization at a stereogenic center occurs.i. Tertiary (3°) alkyl halides react faster than 2° or 1° alkyl halides.j. The reaction follows a second-order rate equation.Which of the statements below are correct about characteristics of an E2 reaction? i) Forms alkene product ii) Requires strong base iii) Minimum of one step iv) Concerted mechanism