1. Which of the following molecules has the lowest strain energy? a. Cyclobutane b. Cyclohexane c. Cycloheptane d....
8. Which of the following is the lowest energy conformer of 2,3-dimethylbutane? н Сн, CH I AI B) II C) III D) IV CH3 H₃C HAC J CH₂ H HC CH₂ H C HC CH HC I 9. Which of the following cycloalkanes has the least angle strain? A) Cycloheptane B) Cyclopropane C) Cyclohexane D) Cyclobutane . . " 10. Which of the following chair conformations represents trans-1,4-dimethylcyclohexane?
Rank the set of substituents below in order of priority according to the Cahn-Ingold-Prelog sequence rules. W-C-CH_BW=CHCH. Dw-cios b o (a) —C=CH (b) -CH=CH2 (c) —C(CH3)3 (d)
You may change your response by submitting again. Rank the following substituents from lowest to highest priority according to the Cahn-Ingold-Prelog rules. -c. -OCH -BH2 -CH NH2 A B D E O B, E, D, A O A, B, E, D O D, E, B, A O D, E, A, B A neutral, sp2-hybridized carbon can forr sigma-bonds and pi-bonds? Submit Submit and Next n: Mark this question for later review
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...
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...
38. Provide the correct hexagonal conformation or Ring-flipped chair conformations for the following cyclohexane (as parent chain) compounds. Then circle the more stable chair conformation. Flat Hexagon structure Chair conformation A H Chair conformation B CHS 2 Dr 2 Br 3 CH3 2 5 3 39. The following compounds have 2 stereogenic carbons, therefore 4 stereoisomeric structures (3 if there is a meso-form) These are not cyclic compounds. a) Draw the structure. b) Identify the stereogenic carbons. Assign the Cahn-Ingold-Prelog...
18. Provide the correct hexagonal conformation or Ring-flipped chair conformats cyclohexane (as parent chain) compounds. Then circle the more stable chair com ir conformations for the following stable chair conformation Flat Hexagon structure formation A Chair conformation B Chair conformation A Chair confort Chair conformation B ..CH3 - CH₃ 39. The following compounds have 2 stereogenic carbons, therefore 4 stereoisomeric structures (3 if there is meso-form) These are not cyclic compounds. a) Draw the structure. b) Identify the stereogenic carbons....
19. Which of the following molecules are achiral? A) II, III B) I, II C) I, IV D) III, IV 20. How many stereogenic centers are present in ephedrine, a bronchodilator and decongestant? ephedrine A) 0 B) 1 C) 2 D) 3 21. Rank the following groups in order of decreasing priority according to the Cahn-Ingold- Prelog system. -NH2 -NHCH3 -CH2NH2 CH2NHCH3 п V . A) B) I>II> III > IV II >I>IV > III II C II >I> III...
29 Give the configurations, respectively, of the following two molecules. CH HO H and CI A. B. C. R and R R and S S and S D. S and R 30 Give the configurations, reypectively, of the folowing two molecules H CH CHy A. B. C. R and R R and S Sand S D. S and R Which one of the following groups has the highest rank as assigned by the Cahn- Ingold-Prelog system for stereogenic (chiral) carbons?...
Q.9. Which of the following compounds does not have a hydrogen deficiency of 5? a 1 b. 2 c. 3 d. 4 Q.10. Which of the following substituents has the highest priority according to the Cahn- Ingold-Prelog system used in assigning E and Z configurations of carbon-carbon double bonds? a. -COOH b -CI C. CHOH d CH Q.11. Which is the correct assignment of the names of the following groups? a. l = methylene; 2 = vinyl; 3 =phenyi b....