19. Which of the following molecules are achiral? A) II, III B) I, II C) I, IV D) III, IV 20. How many stereogenic...
17. Which of the following statements is true? ado on dai Jal A) Achiral molecules usually contain a plane of symmetry B) With one tetrahedral stereogenic center, a molecule may or may not be chiral. C) With two or more stereogenic centers, a molecule is always chiral. D) Chiral molecules usually contain a plane of symmetry 18. Which of the following is the correct definition for a pair of enantiomers? A) A pair of stereoisomers that have a plane of...
15. Rank the following groups in order of decreasing priority according to the Cahn-Ingold- Prelog system. -NH2 -NHCH3 -CH2NH2 -CH2NHCH I IV A) B) I > II > III > IV II >I>IV > III III C) II>I> III > IV D) I> II > IV > 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?...
NUM 55) How many stereogenic centers are present in the following compound County Name: it Name: A) 1 B) 2 ourse: D) 4 Section: 56) Which of the following molecules are achiral? Exam D) I, II A) I, IV B) II, III C) III, IV 57) Which of the following molecules are chiral? I. cis-1,3-Dibromocyclohexane II. 1-Bromo-1-methylcyclohexane III. trans-1-Bromo-3-methylcyclohexane IV. cis-1-Bromo-3-methylcyclohexane A) II, III B) III, IV C) 1, IV D) 1, 58) Which of the following statements is true?...
Q:3. Rank the following from highest to lowest priority according to the Cahn-Ingold- Prelog system. IV. -SH I. -ОН I. -F II.-H Q:4. Rank the following from highest to lowest priority according to the Cahn-Ingold- Prelog system. I. CH II.CN III -CH-ОН IV. -Br Q:5. The structure of Crestor (rosuvastatin), a medication used to reduce cholesterol, is shown below. If the specific rotation for this compound is known to be +100. Will it be dextrorotatory or levorotatory? N. CO2H он...
A. aldehyde A. two 15. W B. ketones C. carboxylic acids D. esters 7. How many stereoisomers of 24-pentanediol are possible? HO D. 6 A. 2 B.3 C. 4 8. Which one of the following is a diastereomer of 2R 3R)-2,3-dibromopentane? B. (25,3R)-2,3-dibromopentane D. (2R, 4R)-2,4-dibromopentane A. (2S,3S)-2,3-dibromopentane C. R-1,2-dibromopentane y. Which one of the following groups has the highest rank as assigned by the Cahn-Ingold Prelog system for stereogenic carbons? A. -CH=CH2 B. -CH2OH C. -CH=0 D.-CH2SH 10. Which...
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....
1. Chirality (6pts, 2EA) Arethe following carbons indicated by the arrow stereogenic-a chiral carbon center). Write yes or DATE: 1104.19 No and explain? Н Нс. Br H Hас" Et 2 CONFIGURATIONS (2PTS, IEA) Assign stereoisomer configuration using R or S nomenclature (NOTE: priorities have been preassigned using Cahn-Ingold-Prelog convention) 3. Multiple Choice-Definition (1pt): Define enantiomers: (Circle the correct choice) Molecules with same molecular formula, and connectivity, but differ in 3-dimenisonal space a. b. Molecules with same molecular formula, and connectivity,...
A. aldehyde B. ketones C. carboxylic acids D. esters 7, How many stereoisomers of 2,4-pentanediol are possible? но он В. З A. 2 C. 4 D. 6 8.Which one of the following is a diastereomer of (2R, 3R)-2,3-dibromopentane? A. (2S,3S)-2,3-dibromopentane C.R-1,2-dibromopentane B. (2S,3R)-2,3-dibromopentane D. (2R,4R)-2,4-dibromopentane 9. Which one of the following groups has the highest rank as assigned by the Cahn-Ir Prelog system for stereogenic carbons? A. -CH-CH2 B. -CH20H C.-CH-0 D. -CH2SH 10. Which of the following statements are...
3. Rank in order of decreasing basicity: HC=C: CHCHO CHC HINO H₂C=Cif I III IV V A. III >I>V > II > IV D. III > IV > II >V>I B. III > V > IV >> II E. IV > II >I> III > V C. V>I> III > II > IV