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- Increased substitution around a bond leads to increased strain. Take the four substituted butanes listed below, for example. For each compound, sight along the C2-C3 bond and draw Newman projections of the most stable and least stable conformations. Use the data in Table 3-5 to assign strain-energy values to each conformation. Which of the eight conformations is most strained? Which is least strained? (a) 2-Methylbutane (b) 2,2-Dimethylbutane (c) 2,3-Dimethylbutane (d) 2,2,3-TrimethylbutaneBy considering viewed through the C-2-C-3 bond, which below conformations of 2,3- dibromobutane show the most stable and the least stable conformation? Clearly explain the reason, why? S CH3 H H Br. H3C, Br H3C Br Br Br H. Br CH3 ČH3 H I II III Br Br H3C, Br H3C H. H3C" H. Br ČH3 IV VÁll of the following conformational models are representative of 2,3-dimethylpentane. Which of these models corresponds to its S isomer? Me H Et Me H. Ме Et H Me Me H. Me Me H H H -iPr Me iPr. H Me Me H
- By considering viewed through the C-2-C-3 bond, which below conformations of 2,3- dibromobutane show the most stable and the least stable conformation? Clearly explain the reason, why? CH3 H Br. H3C, Br H3C H3Č Br Br Br H. ČH3 Br CH3 H I II III Br Br Br H3C. H3C ČH3 H. H3C H. Br IV VAll of the following conformational models are representative of 2,3-dimethylpentane. Which of these models corresponds to its S isomer? Et Me H. OA Me Me Me H Et Me Me OC. iPr H. Me Me H. OD. Me H -iPr H Me 8.All but one of the following conformational models are representative of 2,3-dimethylpentane. Which of these models does not represent this molecule? Ме H. Et Me Ме iPr H -Me Me H. Et H. Me Me Ме Ме H. Me Et "Ме H.
- The most stable conformation of 1,2-dibromoethane is: Select one: Br H. Br Br H. H. Br Br H. Br Br Br Br H.O B. 01 H₂C O. C. O A. O D. For the following structural formula, pick the structure that accurately represents its MOST STABLE conformation. Br CHS A Br CH3 B H₂CH CH3 CH3 Cill Br H₂C Br с CH₂3 H₂C Br. CH3 D hpBelow are isomers of tert-butylcyclohexanol in conformational structures. Two are cis-2-tert- butylcyclohexanol and two are cis-3-tert-butylcyclohexanol. Indicate which is the more stable conformation for each pair, and indicate which of all four conformations is the most stable. A OH Ex HO B D OH OH
- All of the following conformational models are representative of 2,3-dimethylpentane. Which of these models corresponds to its S isomer? Et OA H. Me Me H. Me OB. Me H. Et Me H. Мe OC. iPr H Me Me H. H OD. Me H H H -iPr Me MacBook PrO esc #3 24 % & 3 7 8 Q W E R ecoIdentify the highest and lowest energy conformation. If multiple energy conformations are degenerate, choose only one. Et H. Et Et H. H. MeEt Lowest Energy Me Highest Energy Et H. Et H. Et H. H- H. MeEt Highest Energy Me Lowest Energy Et H. Me H. Me C H H H. Me MeEt Highest Energy Lowest Energy Et H. Me Me H. H H Ме MeEt Lowest Energy Highest Energy OA OB ODConsider the isomers of tert-butylcyclohexanol in conformational structures. Two are cis-2-tert-butylcyclohexanol and two are cis-3-tert-butylcyclohexanol. Indicate which is the more stable conformation for each pair, and indicate which of all four conformations is the most stable. FIX a box OH HO OH A Select the more stable conformation of cis-2-tert-butylcyclohexanol. B OD C B C D ☐A C OH Select the more stable conformation of cis-3-tert-butylcyclohexanol.