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- Consider the molecule 1-bromo-2-methylbutane. C3 and C4 should be drawn as Et as in theexample. This group is called an ethyl group and can be considered a sphere about twice the sizeof a methyl group. Draw the following Newman projections sighting down the C1C2 bond... a. The lowest potential energy conformation. b. The highest potential energy staggered conformation.H;C-CH2-CH–CH3 CH₂-CH3 Relative to the molecule above, which of the below is not a conformer? A. C. HỌC-CH,-CH–CH, CH H₂-CH-C CH3 CH3 CH3-CH-CH-CH3 13-CH-C CH3 B. D. CH3 CH3 CH₂-CH-CH₂ CH3 CH₂ CH-CH₂-CH3 CH₂ CH33. Draw both chair conformations for the cyclohexane molecule shown below, and circle the most stable conformation (the methyl group is larger than the hydroxyl group). OH H3C
- 3. Consider the structure below and draw its most stable and least stable conformations in Newman Projections while looking down the bond indicated پر a. The lowest energy (most stable) conformation is Anti. b. The highest energy (least stable) conformation is eclipsed.a. Which is more stable; cis-1,3-dimethylcyclohexane or trans-1,3- dimethylcyclohexane? i. Draw chair configuration of cis-1,3-dimthylcyclohexane and its alternate chair. conformation shown above. ii. Of the two chair conformation, which is more stable? Explain:. iii. Draw chair configuration of trans-1,3-dimethylcyclohexane and its alternate chair, conformation shown above. iv. Of the two chair conformation, which is more stable? Explain. v. Which is more stable overall, cis or trans form?rotation here a. Draw the three staggered and three eclipsed conformations that result from rotation around the designated bond using Newman projections. b. Label the most stable and least stable conformation. CH3-C-CH,CH3
- g. Draw two chair conformations of the following molecule and indicate which one is more stable. h. Draw the Newman projection of the following molecules. Classify each conformation as staggered or eclipsed around the indicated bond, and rank the conformations in order of increasing stability. CH2CH2CH3 CH3 (CH3)2CH, CH2CH2CH3 (CH3)2CH .C- CH3 CH3 CH3 A6. Newman projections to Lewis structures From the following Newman projections, draw the corresponding Lewis structure in the same conformation. A) B) H. H CH3 H₂C N H OH CI Br CH3 H OH CH36. Draw the two chair conformations of the molecule below. Which is the most stable? HO.
- 6. Consider the following Newman Projections. Which is the most stable conformation? Which is the least stable? Why? H3CB CH3 CH3 H. H. Br H. CH3 H CH3 CH3 Br H B C1. Consider the structure below and draw its most stable and least stable conformations in Newman Projections while looking down the bond indicated. W a. The lowest energy (most stable) conformation is staggered b. The highest energy (least energy) conformation is eclipsed4. For the following structures, draw both possible chair conformations, using a ring flip to go from one to the other, and circle the one that is most stable/lowest energy. (Hint: Use Table 4.8 in Klein.) Show all groups, including hydrogen atoms, attached to the cyclohexane ring. А. Me Me Et В. Et t-Bu Et