Homework Answers
Though this molecule possess two stero-centres, it is optically inactive, because both the stereocentres are mirror images of each other, hence it has a mirror plane(Through C3-C4 bond) and hence is achiral.
Such molecules with multiple stereocentres, which are mirror images of each other are called Meso Compounds.
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H H eclipsed H-CH3 eclipsed CH3 - CH3 eclipsed CH3 - CH3 gauche 3.0 kJ/mol 4.0...
M eclipsed • CH3 - CH3 eclipsed • CH3 CH3 gauche 6.0 kJ/mol 11 kJ/mol 3.8...
M eclipsed • CH3 - CH3 eclipsed • CH3 CH3 gauche 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol D Question 7 8.33 pts What is the relationship between the two structures shown? diastereomers different conformations of the same molecule O identical different compounds with different molecular formulas enantiomers Next • Previous
→ XCIO DE • CH3-H 1,3 diaxial interaction • HH eclipsed • H-CH3 eclipsed • CH3...
→ XCIO DE • CH3-H 1,3 diaxial interaction • HH eclipsed • H-CH3 eclipsed • CH3 - CH3 eclipsed • CH3 - CH3 gauche 3.8 kJ/mol 4.0 kJ/mol 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol Question 11 8.33 pts The specific rotation of enantiomerically pure (+) sucrose is +66º. A particular mixture of () sucrose and sucrose exhibits a specific rotation of (+) 13°. What are the relative percentages of (+) and (-) sucrose in this sample? 80% (+) sucrose: 20%...
Canvas 4 → XCIO E • CH3-H 1, 3 diaxial interaction • H H eclipsed •...
Canvas 4 → XCIO E • CH3-H 1, 3 diaxial interaction • H H eclipsed • H-CH3 eclipsed • CH3 CH3 eclipsed • CH3 - CH3 gauche 3.8 kJ/mol 4.0 kJ/mol 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol D Question 5 8.33 pts Which of the following compounds is/are chiral? 1.1-chloropentane 2.2-chloropentane 3. 3-chloropentane 4.1.2-dichloropentane 5.2.2-dichloropentane 2 and 3 3,4, and 5 2 and 4 2 only 2.3, and 5
: CH3 - CH3 eclipsed • CH3 – CH3 gauche 11 kJ/mol 3.8 kJ/mol D Question...
: CH3 - CH3 eclipsed • CH3 – CH3 gauche 11 kJ/mol 3.8 kJ/mol D Question 10 Assign the appropriate chirality center. CHO HO CH2OH no chirality center OR OS
Consider the two compounds below. Which is expected to be more stable? • H H eclipsed...
Consider the two compounds below. Which is expected to
be more stable?
• H H eclipsed .H CH, eclipsed • CH3 CH3 eclipsed • CH3-CH3 gauche 4.0 kl/mol 6.0kJ/mol 11 kJ/mol 3.8 kJ/mol Question 4 Consider the two compounds below. Which is expected to be more stable? They are . Previous
Name 03.101 example of a reaction having an Eact = 0 would Br• + Br-Br - > Br-Br + Br. F. + CH - > H-F + CH3....
Name 03.101 example of a reaction having an Eact = 0 would Br• + Br-Br - > Br-Br + Br. F. + CH - > H-F + CH3. . CH. + CH, CH2 - CH + CH3 CH2 • .. Br + H-Br - > H-Br + Br. -. CH. + CH3 - > CH3-CH3 Which of the following is true of any (S)-enantiomer? 4. It rotates plane-polarized light to the right. b. It rotates plane-polarized light to the left....
Strain Energy Increments Strain Energy for Alkanes Interaction/Compound kJ/mol kcal/ 4.0 H: Heclipsing 1.0 H: CH3...
Strain Energy Increments Strain Energy for Alkanes Interaction/Compound kJ/mol kcal/ 4.0 H: Heclipsing 1.0 H: CH3 eclipsing 5.8 1.4 CH3 : CH3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 6.3 cycloheptane 26.2 cyclooctane 40.5 9.7 Axial Strain Energies for Monosubstituted Cyclohexanesab This table gives the sum of the values for the 1,3 diaxial interactions of the substituent with two hydrogen atoms. kJ/mol kcal/mol Substituent(solvent) -CH3 1.7 7.3 CH2CH3 7.5 1.8 -CH(CH3)2...
11. Calculate the percentage of each conformer at 23 °C (AEE-RTINK, where R= 8.314J/K mol), ACH₃...
11. Calculate the percentage of each conformer at 23 °C (AEE-RTINK, where R= 8.314J/K mol), ACH₃ н, Сн HC НАС HC CH3 Conformer A Conformer B Interaction Energy Cost (kJ/mol H-H eclipse 4.0 H-CH3 eclipse CH3-CH: eclipse 11.0 CH3-CH3 gauche 3.8 6.0
EXAM 0 would be: 1. An example of a reaction having an E,ct a. Br +Br-Br...
EXAM 0 would be: 1. An example of a reaction having an E,ct a. Br +Br-Br Br-Br Br. b. F CH4 H-FCH3 c. CH3 +CH, CH d. Br. +H-Br >CH4 CH,CH2 H-BrBr CH3-CH e. CH, +CH, 2. Which of the following is true of any (S)-enantiomer? a. It rotates plane-polarized light to the right. It rotates plane-polarized 1ight to the left. C. It is a racemic form. d. It is the mirror image of the corresponding (R)-enantiomer. e. It has...
Strain Energy Increments Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol H: Heclipsing 4.0 1.0 H: CH3...
Strain Energy Increments Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol H: Heclipsing 4.0 1.0 H: CH3 eclipsing 5.8 1.4 CH3 : CHз eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 27.5 115 cyclobutane 110 26.3 cyclopentane 26.0 6.2 cycloheptane 26.2 6.3 cyclooctane 40.5 9.7 Ln Axial Strain Energies for Monosubstituted Cyclohexanesa,b This table gives the sum of the values for the 1,3 diaxial interactions of the substituent with two hydrogen atoms. Substituent(solvent) К/mol kcal/mol -CНз 7,3 1,7 -CH-CHз...
M eclipsed • CH3 - CH3 eclipsed • CH3 CH3 gauche 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol D Question 7 8.33 pts What is the relationship between the two structures shown? diastereomers different conformations of the same molecule O identical different compounds with different molecular formulas enantiomers Next • Previous
→ XCIO DE • CH3-H 1,3 diaxial interaction • HH eclipsed • H-CH3 eclipsed • CH3 - CH3 eclipsed • CH3 - CH3 gauche 3.8 kJ/mol 4.0 kJ/mol 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol Question 11 8.33 pts The specific rotation of enantiomerically pure (+) sucrose is +66º. A particular mixture of () sucrose and sucrose exhibits a specific rotation of (+) 13°. What are the relative percentages of (+) and (-) sucrose in this sample? 80% (+) sucrose: 20%...
Canvas 4 → XCIO E • CH3-H 1, 3 diaxial interaction • H H eclipsed • H-CH3 eclipsed • CH3 CH3 eclipsed • CH3 - CH3 gauche 3.8 kJ/mol 4.0 kJ/mol 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol D Question 5 8.33 pts Which of the following compounds is/are chiral? 1.1-chloropentane 2.2-chloropentane 3. 3-chloropentane 4.1.2-dichloropentane 5.2.2-dichloropentane 2 and 3 3,4, and 5 2 and 4 2 only 2.3, and 5
: CH3 - CH3 eclipsed • CH3 – CH3 gauche 11 kJ/mol 3.8 kJ/mol D Question 10 Assign the appropriate chirality center. CHO HO CH2OH no chirality center OR OS
Consider the two compounds below. Which is expected to
be more stable?
• H H eclipsed .H CH, eclipsed • CH3 CH3 eclipsed • CH3-CH3 gauche 4.0 kl/mol 6.0kJ/mol 11 kJ/mol 3.8 kJ/mol Question 4 Consider the two compounds below. Which is expected to be more stable? They are . Previous
Name 03.101 example of a reaction having an Eact = 0 would Br• + Br-Br - > Br-Br + Br. F. + CH - > H-F + CH3. . CH. + CH, CH2 - CH + CH3 CH2 • .. Br + H-Br - > H-Br + Br. -. CH. + CH3 - > CH3-CH3 Which of the following is true of any (S)-enantiomer? 4. It rotates plane-polarized light to the right. b. It rotates plane-polarized light to the left....
Strain Energy Increments Strain Energy for Alkanes Interaction/Compound kJ/mol kcal/ 4.0 H: Heclipsing 1.0 H: CH3 eclipsing 5.8 1.4 CH3 : CH3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 6.3 cycloheptane 26.2 cyclooctane 40.5 9.7 Axial Strain Energies for Monosubstituted Cyclohexanesab This table gives the sum of the values for the 1,3 diaxial interactions of the substituent with two hydrogen atoms. kJ/mol kcal/mol Substituent(solvent) -CH3 1.7 7.3 CH2CH3 7.5 1.8 -CH(CH3)2...
11. Calculate the percentage of each conformer at 23 °C (AEE-RTINK, where R= 8.314J/K mol), ACH₃ н, Сн HC НАС HC CH3 Conformer A Conformer B Interaction Energy Cost (kJ/mol H-H eclipse 4.0 H-CH3 eclipse CH3-CH: eclipse 11.0 CH3-CH3 gauche 3.8 6.0
EXAM 0 would be: 1. An example of a reaction having an E,ct a. Br +Br-Br Br-Br Br. b. F CH4 H-FCH3 c. CH3 +CH, CH d. Br. +H-Br >CH4 CH,CH2 H-BrBr CH3-CH e. CH, +CH, 2. Which of the following is true of any (S)-enantiomer? a. It rotates plane-polarized light to the right. It rotates plane-polarized 1ight to the left. C. It is a racemic form. d. It is the mirror image of the corresponding (R)-enantiomer. e. It has...
Strain Energy Increments Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol H: Heclipsing 4.0 1.0 H: CH3 eclipsing 5.8 1.4 CH3 : CHз eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 27.5 115 cyclobutane 110 26.3 cyclopentane 26.0 6.2 cycloheptane 26.2 6.3 cyclooctane 40.5 9.7 Ln Axial Strain Energies for Monosubstituted Cyclohexanesa,b This table gives the sum of the values for the 1,3 diaxial interactions of the substituent with two hydrogen atoms. Substituent(solvent) К/mol kcal/mol -CНз 7,3 1,7 -CH-CHз...
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