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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, Δ4. 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 NO2
- Which 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 3which 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?
- 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.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 answer
- What is the enthalpy for reaction 1 reversed? reaction 1 reversed: N2O4→N2 + 202 Express your answer numerically in kJ mol-1.1. 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