Concept explainers
Interpretation:
Using a molecular modeling kit, a model of cyclohexane is to be constructed and viewed so that it looks just like the structure on the left in Figure 4-20. A chair flip is to be performed by moving the two carbon atoms indicated by the red arrows to obtain the conformation on the right in the figure. This procedure is to be reversed and repeated several more times. As you flip the chair back and forth, the bonds of the ring that rotate and the directions in which they rotate are to be identified. Those bonds in the drawing on the left in Figure 4-20 are to be circled and labeled.
Concept introduction:
When we build the cyclohexane model, make sure to include all
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- Figure 7-3 애arrow_forward3. 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 H3Carrow_forwardneed help. Out of the four isomers shown above (menthol, isomenthol, neomenthol, and neoisomenthol), which isomer do you predict is the most stable? It may help to draw out each isomer in its most stable chair conformer to determine which has the most equatorial groups.arrow_forward
- Make a model of cyclooctane. At least 8 different somewhat stable conformations of this molecule can exist. Draw some of the conformations you can find. Can you find a conformation of this ring that is strain-free? Identify the type of strain present in all possible conformations of this molecule.arrow_forwardDraw all the conformers of the molecule on the right as Newman projections sighted along the C3– C4 bond. Label the interactions present in each conformer. Rank the conformers from lowest to highest energy (some may be equal).arrow_forwardC. Using your molecular modeling kit, construct cis-1,4-dimethylcyclohexane. In the space below, draw one of the chair conformations. Label the methyl groups as either axial (a) or equatorial (e). Number the carbons of the cyclohexane ring, perform a chair flip and draw the new chair conformation.arrow_forward
- This problem considers the conformational isomers of 2-methyl-butane shown below. The label for each carbon is indicated in red. Also shown is the Newman projection for the bond between carbons 2 and 3. The Newman projection is shown at its 0o position. The angle increases with clockwise rotation of the bonds on carbon 2. Which rotation angle(s) has(have) the lowest energy? (select all that apply) Which rotation angle(s) has(have) the highest energy? (select all that apply). Which rotation angle(s) has(have) a local anergy minima that is(are) not the lowest energy possible? (select all that apply).arrow_forwardSight 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.arrow_forwardIn the space below, redraw n-butane in this elongated conformation. All C atoms should be drawn in the plane of the paper in a zig-zag to represent the geometry displayed by your model kit. The hydrogen atoms should be attached to the carbon atoms via dashed and wedged bonds, as in question 4C above, to illustrate the three-dimensional geometry of the structure.arrow_forward
- 4. a) Calculate the units of unsaturation for the formula C6H10O2. b) Draw a structure of C6H1002 that has no formal charges and a) ester and ring b) carboxylic acid lotfasss.com 5. A student tried to draw the most stable conformation of the molecule shown below. What is wrong with the Newman projection that they drew? view OCH 3 H H H 6. A student tried to draw one of the chair conformations of the molecule shown below. What is wrong with the chair that they drew? H3C Student answer for most stable Newman Projection H3C. CH3 H OH TH H H H UU .H OCH 3 has: c) ketone and alcohol H 7. Which type(s) of strain are present in the following molecules? (steric, torsional, angle, etc) H H O H H H H H Harrow_forward5. Construct models of all the stereoisomers of 1-bromopropene. Draw the line structure of your models. Are these molecules isomers? If they are isomers to what specific category do they belong? Assign E or Z descriptors to each compound, if appropriate. 6. Construct a model of dibromochloromethane and draw the perspective structure. How many planes of symmetry does this molecule possess? Construct the mirror image of your model. Are the two models superimposable? Classify or describe the relationship between these two mirror images, and assign R or S descriptors, if appropriate.arrow_forwarda) Draw one isomer of C6H14. b) Draw one isomer of C6H12- c) Draw one isomer of C6H140 that exhibits hydrogen bonding. d) Draw one isomer of C6H140 that is not capable of hydrogen bonding. BONUS: Show all locations of possible hydrogen bonding for the C6H140 isomer that you drew above in part c.arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning