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- 9. How many stereo centres are there in the following molecule? OH4. The following molecule was subjected to two different conditions. Provide the product in each case. 1. Mel, K₂CO3 2. Ag₂O, A mCPBA, ΔWhich of the following compounds is chiral? H CH3 H A. CH3-|-C1 CH3-Br CH3-Br CH3-|-C1 CH3-|-C1 CH3-|-C1 CH3 ΟΑ OB ос OD H B. C. H D. CH 3 C1-|-C1 Br Br CH 3
- 4. Explain the following result- what strange regioselectivity is observed and why? (hint, what will always happen in the presence of a strong acid?): HNO3 HOAC NO2 O2N HNO3 H2SO4 NO2which pair is (2R,3S) and (2S, 3R) and which pair is the (2S, 3S) and (2R, 3R)? please point to the stereocenters to answer Ph S Br LOH S Br A. Br Ph S R Br C. OH C 0 Ph R Br Br OH R B. Ph fo Br OH ི་ R Br S D. SHow many atoms of each hybridization state are there (sp,sp2, sp3)?What would be the result after the shown molecule is carried through the 4 step sequence? Show each intermediate and stereochemistry 1. 1eq. MeLi, then H2O workup 2.TsCl/pyr 3.NaOtBu/BuOH 4.OsO4/NaHSO3 And What is the relationship between the isomeric end products from them?
- 4. What is the configuration of all double bonds in the following molecule? Forma 1 2 3 4 5 retinol A. 1: Z; 2: Z; 3: Z; 4: Z; 5: Z B. 1: E; 2: Z; 3: Z; 4: Z; 5: Z C. 1: Z; 2: E; 3: E; 4: E; 5: E D. 1: E; 2: E; 3: E; 4: E; 5: E OHKk.278. Please explain how to get the answerWhat is the enthalpy for reaction 1 reversed? reaction 1 reversed: N2O4→N2 + 202 Express your answer numerically in kJ mol-1.
- What types of orbitals overlap to provide stability to the tert-butyl carbocation ((Ch3) 3C +) by hyperconjugation: a. 2p atomic orbital of tertiary carbon plus sp2 atomic orbital of tertiary carbo b. 2p atomic orbital of tertiary carbon plus sigma C-H molecular orbital of methyl c.2p atomic orbital of tertiary carbon plus 2s C-h atomic orbital of methyl d. sp2 atomic orbital of tertiary carbon plus sigma C-H molecular orbital of methyl.1. Which of the following compounds is separable by a physical method such as distillation? D A B.1. CHǝMgBr A 2. H3O+ 1. KCN B 2. H3O+ 1. CH3Li C 2. H3O+ 1. (CH3)2CULI 2. H3O+ Done