33. Which of the following are anti conformers? CH, H. CH H,C H. CH H. H,C H. CH, CH, CH, IV 3D A) I and II В) I and III C) I and IV D) II and IV
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- True or False: 1. The eclipsed conformation of a linear alkane IS called cis, while the anti conformation of an alkane IS called trans. 2. In the conversion of open-chain D-glucose to the ring form, the aldehyde carbon (carbon #1) bonds to the oxygen on carbon number 5 to form a ring that is both PYRANOSE and UNLOCKED.Rank the following groups in order of decreasing priority. −F, −NH2, −CH3, −OHConsider 1-bromopropane, CH3CH2CH2Br. (a) Draw a Newman projection for the conformation in which CH3 and -Br are anti (dihedral angle 180°). (b) Draw Newman projections for the conformations in which - CH3 and -Br are gauche (dihedral angles 60° and 300°). (c) Which of these is the lowest energy conformation? (d) Which of these conformations, if any, are related by reflection?
- Sight along the C2-C1 bond of 2-methylpropane (isobutane).(a) Draw a Newman projection of the most stable conformation.(b) Draw a Newman projection of the least stable conformation.(c) Make a graph of energy versus angle of rotation around the C2-C1 bond.(d) Assign relative values to the maxima and minima in your graph, given that an H↔H eclipsing interaction costs 4.0 kJ/mol and an H↔CH3 eclipsing interaction costs 6.0 kJ/mol.1,4-Pentadiene (CH2=CH-CH2-CH=CH2) is a liquid at room temperature and has a density of 0.66 g/mL and molar mass of 68.12 g/mol. In a laboratory experiment, 3.80 mL of this compound was treated with 4.80 mL of conc. H2SO4 (100% w/w; molar mass 98.08 g/mol). Note that the density of conc. H2SO4 is 1.84 g/mL. The resulting sulfate ester was then treated with 1.20 mL of water (molar mass 18.02 g/mol) affording, after work- up, 2,4-pentanediol (molar mass 104.15 g/mol) as the crude product. The crude product was then purified by simple distillation, which yielded 2.00 g of pure product. What is the theoretical yield of 2,4-pentanediol expressed in grams? Show calculations. What is the percentage yield of pure 2,4-pentanediol?1,4-Pentadiene (CH2=CH-CH2-CH=CH2) is a liquid at room temperature and has a density of 0.66 g/mL and molar mass of 68.12 g/mol. In a laboratory experiment, 3.80 mL of this compound was treated with 4.80 mL of conc. H2SO4 (100% w/w; molar mass 98.08 g/mol). Note that the density of conc. H2SO4 is 1.84 g/mL. The resulting sulfate ester was then treated with 1.20 mL of water (molar mass 18.02 g/mol) affording, after work- up, 2,4-pentanediol (molar mass 104.15 g/mol) as the crude product. The crude product was then purified by simple distillation, which yielded 2.00 g of pure product. a. Provide a balanced chemical equation to show the reaction between 1,4-pentadiene and sulfuric acid. Do not use molecular formulas in the chemical equation except for sulfuric acid. b. What reactant is the limiting reagent in this chemical equation? Show calculations to support your answer.
- Explain briefly and clearly the following concepts, taking as reference the molecule of n-butane and the corresponding drawings or illustrations. See pages 149-152 of the book Organic Chemistry, sixth edition (J. G. Smith). 4. What is steric hindrance in a conformation? Then draw a picture to illustrate the concept? 5. What is the torsional stress of a conformation? Then draw a picture to illustrate the concept? 6. Describe 1,3-diaxial interaction and illustrate with a specific example.Brainberene, a compound isolated from an organic chemist’s brain, has the molecular formula C16 H26. When Brainberene is subjected to catalytic hydrogenation using an excess of hydrogen, 1 mol of Brainberene absorbs 3 mol of hydrogen and produces B: C16 H32. 1) What is the element of unsatuation (IHD) of Brainberene? 2) How many double bonds and rings do Brainberene has? Laboratory experiments revealed that Brainberene has no triple bonds. 3) What is the IHD of B? d) How many double bonds and rings does B has? 12Create a 3D model of the most stable chair conformation of (1R,3S)-3-chlorocyclohexan-1-ol
- Tert-butylcyclohexane exists practically (> 99.99%) in a single conformational form. Represent in perspective the most stable conformer of trans-4 isopropylcyclohexan-1-ol.Consider 1-bromopropane, CH3CH2CH2Br. (a) Draw Newman projections for the conformations in which -CH3 and -Br are gauche (dihedral angles 60° and 300°).Conformational studies on ethane-1,2-diol (HOCH2¬CH2OH) have shown the most stable conformation about the central C¬C bond to be the gauche conformation, which is 9.6 kJ/mol (2.3 kcal/mol) more stable than the anti conformation. Draw Newman projections of these conformers, and explain this curious result.