Homework Answers
8. Option II is the one with lowest energy, because all the Methane groups are at maximum distance from each other,i.e. it will have lowest repulsion in all possible conformations. It is staggered form and is most stable among others.
9. Angle strain is caused due to deviation of bond angles from 109.5° which causes eclipsing of hydrogens , cyclobutane has 90° so it has high angle strain.
Cyclopentane has relatively less strain than cyclobutane.
Cyclohexane due to its 109.5° bond angle has no angle strain.
Higher cycloalkanes also face angle strains.
Hence cyclohexane has least angle strain. Option C is correct.
(also cycloalkanes have ring structures, not linear )
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8. Which of the following is the lowest energy conformer of 2,3-dimethylbutane? н Сн, CH I...
34 Which of the following is the highest energy conformer of 2,3-dimethylbutane HCH, I M V...
34 Which of the following is the highest energy conformer of 2,3-dimethylbutane HCH, I M V Ho CH ) Ho Ho O Ho HC not A) 1 B) II C) III D) IV 35) - 35) Which of the following chair conformations represents trans-1,3-dimethylcyclohexane? " DIV" C) III B) II 36) Which of the following is the most stable conformation of cis-1-ethyl-3-isopropyleyclohexane? A) B) II 37) Select the most stable conformer of cis-1,3-cyclohexanediol HO dis-1,3-cyclohexanediol но Тон OH OH HO...
L. Give the IUPAC name for the cycloalkane shown below. CH, I CH,CH 4. Which of...
L. Give the IUPAC name for the cycloalkane shown below. CH, I CH,CH 4. Which of the following correctly ranks the cycloalkanes in order of increasing ring strain per methylene? a. cyclopropane < cyclobutane < cyclohexane < cyclopentane b. cyclohexane < cyclopentane < cyclobutane < cyclopropane c. cyclohexane < cyclobutane < cyclopentane < cyclopropane d. cyclopentane < cyclopropane < cyclobutane < cyclohexane e. cyclopropane < cyclopentane < cyclobutane < cyclohexane Draw a chair-form conformer of cyclohexane. Label the axial hydrogens...
Which of the following is the highest energy conformer of 2,3- dimethylbutane? CH, нсн НАС CH3...
Which of the following is the highest energy conformer of 2,3- dimethylbutane? CH, нсн НАС CH3 н,с снэ сн, Hct VCH н,с н, н,с Hic нс CHE
8. What is the IUPAC name for the following compound? A) 2,3-Dimethyl-4-sec-butylheptane B) 4-sec-Butyl-2,3-dimethylheptane C) 3,5,6-Trimethyl-4-propylheptane...
8. What is the IUPAC name for the following compound? A) 2,3-Dimethyl-4-sec-butylheptane B) 4-sec-Butyl-2,3-dimethylheptane C) 3,5,6-Trimethyl-4-propylheptane D) 2,3,5-Trimethyl-4-propylheptane 9. Rank the conformers of butane in order of decreasing stability, putting the most stable first. CH3 Онс сн сн, H CH CH н, сH, н" CH3 Н. H FH H H н H H H н H H IV C) II> III> I> IV D) I>IV> II>II A) IV>I>II> III B) IV>1>1II> II 10. Which of the following chair conformations represents...
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...
9. Rank the conformers of butane in order of decreasing stability, putting the most stable first....
9. Rank the conformers of butane in order of decreasing stability, putting the most stable first. Н. CH3 H ac CH3 H CH3 CH3 HCH TH ΣΕΗ CH, HYH H HHHH н CH, I A) B) IV>I>II> III IV > I > III > II C) D) II > III >I> IV I>IV > II > III 10. Which of the following chair conformations represents trans-1,3-dimethylcyclohexane? A) I B) II C III D IV 11. Which of the following chair...
1. Which of the following molecules has the lowest strain energy? a. Cyclobutane b. Cyclohexane c. Cycloheptane d....
1. Which of the following molecules has the lowest strain energy? a. Cyclobutane b. Cyclohexane c. Cycloheptane d. Cyclopropane 2. Which of the following arranges the groups in order of decreasing priority according to the sequence rules? a. CH3 > CH2CH3 > CH2OH > CO2H c. CH2OH > CO2H > CH2CH3 > CH3 b. CH3 > CH2CH3 > CO2H >CH2OH d. CO2H > CH2OH > CH2CH3 > CH3 3. Which of the following structures represent a meso compound? a. b....
b. Which of the following alkanes has the highest bolling point? 2,3-dimethylbutane: 2-methylpentane; 3-methylpentane; hexane c....
b. Which of the following alkanes has the highest bolling point? 2,3-dimethylbutane: 2-methylpentane; 3-methylpentane; hexane c. Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups? 1,1-dimethylcyclohexane; cis-1,2-dimethylcyclohexane; trans-1,2-dimethylcyclohexane; trans-1,3-di methylcyclohexane d. Which of the following compounds can adopt a chair conformation which there are no axial methyl groups? cis-1,2-dimethylcyclohexane; cis-1,3-dimethylcyclohexane; trans-1,3-dimethylcyclohexane; cis-1.4-dimethylcyclohexane cis-1,2-dimethvcyclohexane (Enter the numerical value only, without any units)? e. What is the approximate di hedral angle between the...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments)...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions (axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) OH H3C...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calcula...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) A CH3...
34 Which of the following is the highest energy conformer of 2,3-dimethylbutane HCH, I M V Ho CH ) Ho Ho O Ho HC not A) 1 B) II C) III D) IV 35) - 35) Which of the following chair conformations represents trans-1,3-dimethylcyclohexane? " DIV" C) III B) II 36) Which of the following is the most stable conformation of cis-1-ethyl-3-isopropyleyclohexane? A) B) II 37) Select the most stable conformer of cis-1,3-cyclohexanediol HO dis-1,3-cyclohexanediol но Тон OH OH HO...
L. Give the IUPAC name for the cycloalkane shown below. CH, I CH,CH 4. Which of the following correctly ranks the cycloalkanes in order of increasing ring strain per methylene? a. cyclopropane < cyclobutane < cyclohexane < cyclopentane b. cyclohexane < cyclopentane < cyclobutane < cyclopropane c. cyclohexane < cyclobutane < cyclopentane < cyclopropane d. cyclopentane < cyclopropane < cyclobutane < cyclohexane e. cyclopropane < cyclopentane < cyclobutane < cyclohexane Draw a chair-form conformer of cyclohexane. Label the axial hydrogens...
Which of the following is the highest energy conformer of 2,3- dimethylbutane? CH, нсн НАС CH3 н,с снэ сн, Hct VCH н,с н, н,с Hic нс CHE
8. What is the IUPAC name for the following compound? A) 2,3-Dimethyl-4-sec-butylheptane B) 4-sec-Butyl-2,3-dimethylheptane C) 3,5,6-Trimethyl-4-propylheptane D) 2,3,5-Trimethyl-4-propylheptane 9. Rank the conformers of butane in order of decreasing stability, putting the most stable first. CH3 Онс сн сн, H CH CH н, сH, н" CH3 Н. H FH H H н H H H н H H IV C) II> III> I> IV D) I>IV> II>II A) IV>I>II> III B) IV>1>1II> II 10. Which of the following chair conformations represents...
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...
9. Rank the conformers of butane in order of decreasing stability, putting the most stable first. Н. CH3 H ac CH3 H CH3 CH3 HCH TH ΣΕΗ CH, HYH H HHHH н CH, I A) B) IV>I>II> III IV > I > III > II C) D) II > III >I> IV I>IV > II > III 10. Which of the following chair conformations represents trans-1,3-dimethylcyclohexane? A) I B) II C III D IV 11. Which of the following chair...
1. Which of the following molecules has the lowest strain energy? a. Cyclobutane b. Cyclohexane c. Cycloheptane d. Cyclopropane 2. Which of the following arranges the groups in order of decreasing priority according to the sequence rules? a. CH3 > CH2CH3 > CH2OH > CO2H c. CH2OH > CO2H > CH2CH3 > CH3 b. CH3 > CH2CH3 > CO2H >CH2OH d. CO2H > CH2OH > CH2CH3 > CH3 3. Which of the following structures represent a meso compound? a. b....
b. Which of the following alkanes has the highest bolling point? 2,3-dimethylbutane: 2-methylpentane; 3-methylpentane; hexane c. Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups? 1,1-dimethylcyclohexane; cis-1,2-dimethylcyclohexane; trans-1,2-dimethylcyclohexane; trans-1,3-di methylcyclohexane d. Which of the following compounds can adopt a chair conformation which there are no axial methyl groups? cis-1,2-dimethylcyclohexane; cis-1,3-dimethylcyclohexane; trans-1,3-dimethylcyclohexane; cis-1.4-dimethylcyclohexane cis-1,2-dimethvcyclohexane (Enter the numerical value only, without any units)? e. What is the approximate di hedral angle between the...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions (axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) OH H3C...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) A CH3...
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