Homework Answers
The deviation from ideal values of bond angles and bond lengths determines strain in a molecule. Three types of strain are angle strain, steric strain, and torsional strain.
Angle strain in a molecule is determined by the Baeyer’s strain theory. Deviation from actual tetrahedral bond angle is the reason for the angle strain.
Steric effect is determined by the interaction between the substituent. If the bulky groups are in close proximity of each other then, the compound will be unstable due to overcrowding of the substituents.
Torsional strain is determined by the repulsion between the bonding pair of electrons. It is also known as eclipsing strain as it is also present in the molecule having eclipsing conformation due to overcrowding of the electron pair on the substituents. Due to torsional strain the potential energy of the conformation increases.
(a)
Draw the structure of the given compounds and mark the bond angle in each case as shown below:
The molecule having maximum angle strain is 
.
(b)
Draw the structure of the given compounds and show the interaction between the bulky substituents as shown below:
The molecule having maximum steric strain is 
.
(c)
Draw the given structure of substituted cyclohexane ring and marked the position of substituents as shown below:
Hence, the molecule having the maximum torsional strain is .
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Which of these structures has the most angle strain?
Which of these structures has the most...
6. Build the cyclobutane ring and study the angle strain and torsional strain. Draw the structures to explain thes...
6. Build the cyclobutane ring and study the angle strain and torsional strain. Draw the structures to explain these factors. 7. The conformation of cyclobutane is slightly folded. Folding gives partial relief from the eclipsing of bonds, as shown in the Newman projection. Compare this actual structure with the hypothetical planar structure. Draw the relevant structures. 8. trans-1,2-Dimethylcyclobutane is more stable than cis-1,2-dimethylcyclobutane, but cis-1,3- dimethylcyclobutane is more stable than trans-1,3-dimethylcyclobutane. Use the molecular models to find the reasons for...
Observations. нь со скрипис 9. Build the cyclopentane ring and study the angle strain and torsional...
Observations. нь со скрипис 9. Build the cyclopentane ring and study the angle strain and torsional strain in the ring. Draw the structures to explain these factors. Cyclopentane actually assumes a slightly puckered "envelope" conformation that reduces the eclipsing and lowers the torsional strain. Convince yourself about this fact. Provide the relevant drawings. 10. Build the cyclohexane ring and study the angle strain and torsional strain. Build the chair and boat conformations and identify the axial and equatorial bonds. Also...
Cyclopropane is more reactive than most cycloalkanes. What factors lead to cyclopropane being less stable than...
Cyclopropane is more reactive than most cycloalkanes. What factors lead to cyclopropane being less stable than other cycloalkanes? a. Angle strain b. Torsional strain c. Torsional strain, angle strain and steric strain d. Steric strain e. Torsional strain and angle strain of. Torsional strain and steric strain g. Angle strain and steric strain
Specify the types of strain that destabilize the conformer shown below. Hint: All bonds not explicitly...
Specify the types of strain that destabilize the conformer shown below. Hint: All bonds not explicitly shown are in the staggered conformation. 1. Torsional strain 2. Angle (ring) strain 3. Steric (van der Waals) strain CH3 H H H. H CH3 Calculate strain energy for the conformer pictured below, using strain energy increments from the table. Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol 4.0 1.0 H: H eclipsing H: CH3 eclipsing CH3 : CH3 eclipsing 5.8 1.4 11.0...
Draw the structure of cis-1,2-dimethylcyclopropane and clearly label the sources of angle, steric, and torsional strain...
Draw the structure of cis-1,2-dimethylcyclopropane and clearly label the sources of angle, steric, and torsional strain present in this molecule.
How can I tell if there is Bond Angle strain, Steric Strain, or Torsional strain just...
How can I tell if there is Bond Angle
strain, Steric Strain, or Torsional strain just by looking at the
conformations?
(2 points) 7. List all of the types of strain in the following (2 points) 8. List all of the types of strain in the following conformation. Do not rotate any bonds. Use BAS, TS and/or SS. conformation. Do not rotate any bonds. Use BAS, TS and/or SS. If If no strain is present, write "NO Strain" no strain...
which strains are present or not present? Specify the types of strain that destabilize the conformer...
which strains are present or not present?
Specify the types of strain that destabilize the conformer shown below. Hint: All bonds not explicitly shown are in the staggered conformation. 1. Torsional strain 2. Angle (ring) strain 3. Steric (van der Waals) strain HH H₃C "Z CH₂ CH3 Previous
3B) Draw the constitutional isomers of trimethylcyclopropane as skeletal structures. 3C) For each constitutional isomer you...
3B) Draw the constitutional isomers of trimethylcyclopropane as
skeletal structures.
3C) For each constitutional isomer you drew in part (a), draw
any stereoisomers of that structure, explicitly showing
stereochemistry with dash/wedge bonds. Use skeletal structures.
2. This molecule has a ring strain of 70 kl/mol. Circle which type of strain is most important, and explain why you circledit: Angle torsional steric 3. Only one stereoisomer of this compound is stable - draw the relative stereochemistry at the ring Junction with...
14. What types of strain are found in trans--1,3-dimethylcyclohexane? CH3 7 SCH a. Angle strain b....
14. What types of strain are found in trans--1,3-dimethylcyclohexane? CH3 7 SCH a. Angle strain b. Torsional strain c. Steric strain d. More than 1 of the above 15. Which of the following compounds is meso? OH | H | C | 16. Which of the following Fischer projects is for an achiral molecule?! OH | OH OH OH Hㅐ 애 H HH HO|—H HO|H H —OH HOẠ |_H 바애 애 HI-OH HI-OH HOH HOLH HO HO HO ㅎF 호...
Questions 7, 8, and 9 Which of the following cycloalkanes has the most angle strain? Which...
Questions 7, 8, and 9
Which of the following cycloalkanes has the most angle strain? Which is the least stable chair conformer of the following compound? Are the two substituents cis or trans?
6. Build the cyclobutane ring and study the angle strain and torsional strain. Draw the structures to explain these factors. 7. The conformation of cyclobutane is slightly folded. Folding gives partial relief from the eclipsing of bonds, as shown in the Newman projection. Compare this actual structure with the hypothetical planar structure. Draw the relevant structures. 8. trans-1,2-Dimethylcyclobutane is more stable than cis-1,2-dimethylcyclobutane, but cis-1,3- dimethylcyclobutane is more stable than trans-1,3-dimethylcyclobutane. Use the molecular models to find the reasons for...
Observations. нь со скрипис 9. Build the cyclopentane ring and study the angle strain and torsional strain in the ring. Draw the structures to explain these factors. Cyclopentane actually assumes a slightly puckered "envelope" conformation that reduces the eclipsing and lowers the torsional strain. Convince yourself about this fact. Provide the relevant drawings. 10. Build the cyclohexane ring and study the angle strain and torsional strain. Build the chair and boat conformations and identify the axial and equatorial bonds. Also...
Cyclopropane is more reactive than most cycloalkanes. What factors lead to cyclopropane being less stable than other cycloalkanes? a. Angle strain b. Torsional strain c. Torsional strain, angle strain and steric strain d. Steric strain e. Torsional strain and angle strain of. Torsional strain and steric strain g. Angle strain and steric strain
Specify the types of strain that destabilize the conformer shown below. Hint: All bonds not explicitly shown are in the staggered conformation. 1. Torsional strain 2. Angle (ring) strain 3. Steric (van der Waals) strain CH3 H H H. H CH3 Calculate strain energy for the conformer pictured below, using strain energy increments from the table. Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol 4.0 1.0 H: H eclipsing H: CH3 eclipsing CH3 : CH3 eclipsing 5.8 1.4 11.0...
How can I tell if there is Bond Angle
strain, Steric Strain, or Torsional strain just by looking at the
conformations?
(2 points) 7. List all of the types of strain in the following (2 points) 8. List all of the types of strain in the following conformation. Do not rotate any bonds. Use BAS, TS and/or SS. conformation. Do not rotate any bonds. Use BAS, TS and/or SS. If If no strain is present, write "NO Strain" no strain...
which strains are present or not present?
Specify the types of strain that destabilize the conformer shown below. Hint: All bonds not explicitly shown are in the staggered conformation. 1. Torsional strain 2. Angle (ring) strain 3. Steric (van der Waals) strain HH H₃C "Z CH₂ CH3 Previous
3B) Draw the constitutional isomers of trimethylcyclopropane as
skeletal structures.
3C) For each constitutional isomer you drew in part (a), draw
any stereoisomers of that structure, explicitly showing
stereochemistry with dash/wedge bonds. Use skeletal structures.
2. This molecule has a ring strain of 70 kl/mol. Circle which type of strain is most important, and explain why you circledit: Angle torsional steric 3. Only one stereoisomer of this compound is stable - draw the relative stereochemistry at the ring Junction with...
14. What types of strain are found in trans--1,3-dimethylcyclohexane? CH3 7 SCH a. Angle strain b. Torsional strain c. Steric strain d. More than 1 of the above 15. Which of the following compounds is meso? OH | H | C | 16. Which of the following Fischer projects is for an achiral molecule?! OH | OH OH OH Hㅐ 애 H HH HO|—H HO|H H —OH HOẠ |_H 바애 애 HI-OH HI-OH HOH HOLH HO HO HO ㅎF 호...
Questions 7, 8, and 9
Which of the following cycloalkanes has the most angle strain? Which is the least stable chair conformer of the following compound? Are the two substituents cis or trans?
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