Consider the two compounds below. Which is expected to be more stable?
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Consider the two compounds below. Which is expected to
be more stable?
• H H eclipsed...
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
H H eclipsed H-CH3 eclipsed CH3 - CH3 eclipsed CH3 - CH3 gauche 3.0 kJ/mol 4.0...
H H eclipsed H-CH3 eclipsed CH3 - CH3 eclipsed CH3 - CH3 gauche 3.0 kJ/mol 4.0 kJ/mol 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol Question 12 8.33 pts (3R.45) 3,4-dimethylhexane is optically active and rotates plane-polarized light to the left. is optically inactive because it is racemic. is optically active and rotates plane-polarized light to the right. O is optically active, but its direction of rotation of plane-polarized light can only be determined by experiment. is optically inactive because it is...
→ 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%...
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
x Consider 2,2,3-trimethylbuttane. Using a Newman projection formula, draw the most stable conformation, sighting along the...
x Consider 2,2,3-trimethylbuttane. Using a Newman projection formula, draw the most stable conformation, sighting along the C2-C3 bond. Compute the total strain energy for this conformation. Refer to strain energy values given below. Strain energies with respect to atoms/groups bonded to C-C (one atom/group bonded to each C) H <---> H eclipsed: 4 kJ/mol CH3 <---> H eclipsed: 6 kJ/mol CH3 <----> CH3 eclipsed: 11 kJ/mol CH3 <----> CH3 gauche staggered: 3.8 kJ/mol Selected Answer: D. 7.6 kJ/mol Answers: A....
: 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
Which is the most stable Newman projection of the molecule below, assuming a Br-CH3 gauche interaction...
Which is the most stable Newman projection of the molecule below, assuming a Br-CH3 gauche interaction is 0.5 kcal/mol and a CH3-CH3 gauche interaction is 1.0 kcal/mol? Br CH3 - CH- -CH 2 -CH3 CH3 CH3 CH3 H Н. Br Br H H H Br H H H CH3 Br сн. сн., H a. сн. c. H d. CH Oooooooo Moving to another question will save this response MacBook AS ese
Which of the following two conformations of cis-1-isopropyl-4-methylcyclohexane is more stable? Use the strain energy increments...
Which of the following two conformations of
cis-1-isopropyl-4-methylcyclohexane is
more stable? Use the strain energy increments in the table below
estimate the energy difference (a positive number) between
them.
Which of the following two conformations of cis-1-isopropyl-4-methylcyclohexane is more stable? Use the strain energy increments in the table below estimate the energy difference (a positive number) between them. 1,3-Diaxial Strain Energies for Monosubstituted Cyclohexanes SubstituentkJ/mol Substituent kJ/mol 0.4 0.5 -C CH, ethynyl 0.85 2.95 2.95 -CH-CH23.55 3.64 -CH2CH 3.65 -CN,...
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
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
H H eclipsed H-CH3 eclipsed CH3 - CH3 eclipsed CH3 - CH3 gauche 3.0 kJ/mol 4.0 kJ/mol 6.0 kJ/mol 11 kJ/mol 3.8 kJ/mol Question 12 8.33 pts (3R.45) 3,4-dimethylhexane is optically active and rotates plane-polarized light to the left. is optically inactive because it is racemic. is optically active and rotates plane-polarized light to the right. O is optically active, but its direction of rotation of plane-polarized light can only be determined by experiment. is optically inactive because it is...
→ 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%...
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
x Consider 2,2,3-trimethylbuttane. Using a Newman projection formula, draw the most stable conformation, sighting along the C2-C3 bond. Compute the total strain energy for this conformation. Refer to strain energy values given below. Strain energies with respect to atoms/groups bonded to C-C (one atom/group bonded to each C) H <---> H eclipsed: 4 kJ/mol CH3 <---> H eclipsed: 6 kJ/mol CH3 <----> CH3 eclipsed: 11 kJ/mol CH3 <----> CH3 gauche staggered: 3.8 kJ/mol Selected Answer: D. 7.6 kJ/mol Answers: A....
: 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
Which is the most stable Newman projection of the molecule below, assuming a Br-CH3 gauche interaction is 0.5 kcal/mol and a CH3-CH3 gauche interaction is 1.0 kcal/mol? Br CH3 - CH- -CH 2 -CH3 CH3 CH3 CH3 H Н. Br Br H H H Br H H H CH3 Br сн. сн., H a. сн. c. H d. CH Oooooooo Moving to another question will save this response MacBook AS ese
Which of the following two conformations of
cis-1-isopropyl-4-methylcyclohexane is
more stable? Use the strain energy increments in the table below
estimate the energy difference (a positive number) between
them.
Which of the following two conformations of cis-1-isopropyl-4-methylcyclohexane is more stable? Use the strain energy increments in the table below estimate the energy difference (a positive number) between them. 1,3-Diaxial Strain Energies for Monosubstituted Cyclohexanes SubstituentkJ/mol Substituent kJ/mol 0.4 0.5 -C CH, ethynyl 0.85 2.95 2.95 -CH-CH23.55 3.64 -CH2CH 3.65 -CN,...
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
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