18. Which carbanion is the most stable A. methyl carbanion (CH3-) B. ethyl carbanion (CH3CH2-) C. isopropyl carbanion ((CH3)2CH-) D.Chloromethyl carbanion (CICH2-)

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Chapter22: Organic And Biological Molecules
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Problem 130AE: a. Use bond energies (see Table 3-3) to estimate H for the reaction of two molecules of glycine to...
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18. Which carbanion is the most stable
A. methyl carbanion (CH3-)
B. ethyl carbanion (CH3CH2-)
C. isopropyl carbanion ((CH3)2CH-)
D.Chloromethyl carbanion (CICH2-)
19. Which structural effect best explains the observed trend below:
Compound C-CI bond length (A)
1.78
1.77
1.76
H3C-CI
CIH₂C-CI
Cl₂HC-CI
FH₂C-CI
1.76
A. resonance B. C-H hyperconjugation C. Inductive effect D. steric effect
20. Assuming that each methyl/hydrogen 1,3-diaxial interaction destabilizes the
methyl substituted cyclohexane by 0.9 kcal/mole; then what is the energy
difference between 2 chair conformations of cis-1,3-dimethylcyclohexane.
A. 0.9 kcal/mol
B. 1.8 kcal/mol
C. 2.7 kcal/mol
D. 3.6 kcal/mol
Transcribed Image Text:18. Which carbanion is the most stable A. methyl carbanion (CH3-) B. ethyl carbanion (CH3CH2-) C. isopropyl carbanion ((CH3)2CH-) D.Chloromethyl carbanion (CICH2-) 19. Which structural effect best explains the observed trend below: Compound C-CI bond length (A) 1.78 1.77 1.76 H3C-CI CIH₂C-CI Cl₂HC-CI FH₂C-CI 1.76 A. resonance B. C-H hyperconjugation C. Inductive effect D. steric effect 20. Assuming that each methyl/hydrogen 1,3-diaxial interaction destabilizes the methyl substituted cyclohexane by 0.9 kcal/mole; then what is the energy difference between 2 chair conformations of cis-1,3-dimethylcyclohexane. A. 0.9 kcal/mol B. 1.8 kcal/mol C. 2.7 kcal/mol D. 3.6 kcal/mol
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