3. Provide structure for the following: The number of stereoisomers that exist for 2,4-hexadiene and for 2-chloro-2,4-hexadiene. (1) 4. Sketch curves showing the energy changes that arise from rotation about the C2-C3 bond of 2,2,3,3- tetramethylbutane. Label all maxima and minima with the appropriate conformations. (no need of actual numerical values of the energy changes) (1)

3. Provide structure for the following: The number of stereoisomers that exist for 2,4-hexadiene and for 2-chloro-2,4-hexadiene. (1) 4. Sketch curves showing the energy changes that arise from rotation about the C2-C3 bond of 2,2,3,3- tetramethylbutane. Label all maxima and minima with the appropriate conformations. (no need of actual numerical values of the energy changes) (1)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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11. Using the templates provided below, draw the two different chair conformations for 1-isopropyl-1,4- dimethylcyclohexane where the methyl groups are trans to each other. One of the templates has been numbered to help, it is recommended that you label the other template as well! Next, calculate the amount of strain in each molecule and write the answer beneath each structure. Lastly, circle the most stable conformation. Use units of kJ/mol, the values you need are in table form in the notes module on canvas. 2 OH OH
).(a) Draw Newman projections for the anti, gauche and eclipsed conformers 3(1 of 3,3-dichlorohexane as viewed through C-3 (the third carbon) You do not need to draw the graph nor all of the gauche structures. One of each type is enough. Need 3 total structures 3(b) Rank them in order of stability (1-most stable, 3-least stable) 3© What types of strain are present in each
3.(a) Draw Newman projections for the anti, gauche and fully eclipsed conformers of hexane as viewed through C-3 (the third carbon) You do not need to draw the graph nor all of the structures. One of each type is enough (b) Rank them in order of stability (1-most stable, 3-least stable) © What types of strain are present in each
1. The cyclohexane derivative shown below exists primarily in its most stable chair conformation. Given this, indicate which positions (axial or equatorial) the indicated groups [(1)-(3)] would occupy in the most stable chair conformation. н (2) (3) a. (1) = equatorial; (2) = axial; (3) = equatorial b. (1) = equatorial; (2) = equatorial; (3) = equatorial c. (1) = axial; (2) = equatorial; (3) = equatorial d. (1) = axial; (2) = axial; (3) = equatorial %3D %3D %3D 2. Which structure shown below has a chiral center? -Br HO OH a. b. с. d. 3. Consider a Reaction Coordinate diagram for a one step reaction (not provided). Which of the following species would be the highest in energy? a. Intermediate b. Transition state c. Reactants d. Products
2)- Determine the total number of conformers of the tetra-substituted cyclohexane structure given below (L.e, Draw the chair conformers of A that are, 6-levels of stability from the most stable of A, the sixth most staat conformer ofA, 9-levels that is unstable from the most unstable of A, and 5-levels of insta from the most unstable of A and the conformers of A that is representative of B. Note, only a total of six structures should be written on your paper. Also, include hydrogen atoms wherever are substituents on all of your chair conformers. Note, a table listing is a requirement for this problerm Answer (Total # of Conformers of A): 6-Levels of stability from the most stable of A: The sixth most stable conformer of A: 9-Levels that is unstable from the most unstable of A 5-levels of instability from the most unstable of A 스 Conformers of A that is representative of B:
4. Draw the chair conformations of cis-1,2-dimethylcyclohexane. Label each and rank their stability (lower energy = more stability) from most stable to least. Provide a rationale in terms of atom-atom interactions.
4.(a). Draw the structures of (i) cis-1,4-Dibromocyclohexane and (ii) trans-1,4- Dibromocyclohexane. 4(b). Draw the most stable conformers of (i) cis-1,4-Dibromocyclohexane and (ii) trans-1,4-Dibromocyclohexane. 4(c)Which is more stable? (i) cis-1,4-Dibromocyclohexane or (ii) trans-1,4- Dibromolcyclohexane. Explain the reason for your choice.
Draw two cyclic constitutional isomers of trans-1,2-dimethylcyclopentane with the same size ring. • In cases where there is only one cyclic constitutional isomer, just draw one structure. • If there are more than two isomers, draw any two of the possible structures. • Your drawing must specify cis/trans stereochemistry unambiguously using wedged and dashed bonds. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. ? ChemDoodle it's
2. (6) Draw trans-1-chloro-3-ethylcyclohexane in the box below and assign the stereocenters (doesn't matter which enantiomer you draw). Then draw any diastereomer , any chiral constitutional isomer (+1 XC draw any one achiral constitutional isomer) C, = R or S C, =Ror S trans-1-chloro-3-ethylcyclohexane Any diastereomer CHIRAL constit. isome ACHIRAL constit. isomer
8. Consider 1-bromo-2-methylpropane. Draw a Newman projection of the following (when viewed directlyalong the C1-C2 bond) a. staggered conformation of lowest energyb. eclipsed conformation of highest energy
Chemistry 9) Write Newman projections for the gauche and anti-conformations of 1,2- dibromoethane (BrCH2CH2Br). Which conformation is more stable than the other and explain why?
1. Which of the following formulae represent the same compound? (1) CH;CH,CH;CHCH3 (3) CH-CНCH, 1. CH2 (2) CH3 CH3 CHCH;CH2 CH3 CH3 CH;CH3 (4) CH;CHCH,CH,CH3 (5) CH;CH,CHCH;CH3 CH3 CH3 A. (2) and (3) only В. (1), (2) and (4) only С. (1), (4) and (5) only D. (1), (2), (3) and (4) only