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17. Which of the following statements is true? ado on dai Jal A) Achiral molecules usually...
NUM 55) How many stereogenic centers are present in the following compound County Name: it Name: A) 1 B) 2 ourse: D...
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?...
19. Which of the following molecules are achiral? A) II, III B) I, II C) I, IV D) III, IV 20. How many stereogenic...
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....
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?...
Which of the following is a true statement? A. All achiral molecules are meso.
Which of the following is a true statement? A. All achiral molecules are meso. b. All chiral molecules possess a plane of symmetry. c. All molecules which posses a single asymmetric center of the S configuration are levorotatory . D. A mixture of achiral compounds will be optically inactive. E. All molecules which possess 2 or more chirality centers will be chiral.
3. Diastereomers and Meso Forms. When a molecule has two or more stereogenic centers, stereoisomers that...
3. Diastereomers and Meso Forms. When a molecule has two or more stereogenic centers, stereoisomers that are not mirror images can exist; these are called diastereoisomers. Within this general class, there are special types of stereoisomers that are always optically inactive and are called meso forms. Construct a model with four different colored balls about a carbon center. Construct another identical to the first and verify this by the superimposition test. Now remove the same colored balls, blue (C from...
Circle all the molecules that have an internal plane of symmetry. Note: rotation around a C-C...
Circle all the molecules that have an internal plane of symmetry. Note: rotation around a C-C bond may be required to see a plane of symmetry (0.4 pts) HCI OH OH H Quinox is a P-stereogenic bisphosphine ligand. Determine the (RS) configurations of the phosphorus atoms, draw the mirror image of the compound, and label the compound as chiral or achiral. (0.5 pts) Chiral or Achiral? If one of the two chiral centers in a molecule has the R-configuration and...
Figure 2: How many chiral carbons does this model have? a Does this model have a...
Figure 2: How many chiral carbons does this model have? a Does this model have a plane of symmetry? Rotate the central bond to see b. possible conformations before answering/ Yes No Make the mirror image model of this molecule. Are the mirror images identical? Yes No C. dl What is the term for the relationship between these structures? Are these structures chiral €or achiral? Switch two of the groups on one of the carbons of one model, resulting in...
Which statement(s) about meso compounds is (are) true? Choose all that applies: a. Meso compounds are...
Which statement(s) about meso compounds is (are) true? Choose all that applies: a. Meso compounds are optically inactive. b. Meso compounds contain a plane of symmetry. c. A meso compound and enantiomers are superimposable mirror images of each other. d. A meso compound contains at least one chiral center. e. A meso compound has same physical properties from its stereoisomers.
9. C (Z-2-hexene d. They are all of equal stability. Choose the most stable alkene among...
9. C (Z-2-hexene d. They are all of equal stability. Choose the most stable alkene among the following a 1-hexene b. (E)-2-hexene 10. What is the relation between an enantiomer's configuration and its specific rotation? (a) Rcompounds usually are dextrorotatory with few exceptions (b) R compounds always are dextrorotatory. (c) There is no relation. (d) R compounds always are levorotatory 11. How many chiral centers are there in tartaric acid, and how many different stereoisomers exist for this acid? он...
How many of the following statements are true?
19) How many of the following statements are true? i) Enantiomers are always chiral ii) A molecule that has a plane of symmetry can never be chiral. iii) An achiral molecule will always have an enantiomer. iv) A chiral molecule will always have an enantiomer v) Enantiomers are always nonsuperimposable a) 0 b) 1 c) 2 d) 3 e) 4 ab) 520. Identify the stereochemistry in each of the following compounds as R or S.Give the correct IUPAC name for the following compounds. For alkenes, when appropriate, indicate...
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?...
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?...
3. Diastereomers and Meso Forms. When a molecule has two or more stereogenic centers, stereoisomers that are not mirror images can exist; these are called diastereoisomers. Within this general class, there are special types of stereoisomers that are always optically inactive and are called meso forms. Construct a model with four different colored balls about a carbon center. Construct another identical to the first and verify this by the superimposition test. Now remove the same colored balls, blue (C from...
Circle all the molecules that have an internal plane of symmetry. Note: rotation around a C-C bond may be required to see a plane of symmetry (0.4 pts) HCI OH OH H Quinox is a P-stereogenic bisphosphine ligand. Determine the (RS) configurations of the phosphorus atoms, draw the mirror image of the compound, and label the compound as chiral or achiral. (0.5 pts) Chiral or Achiral? If one of the two chiral centers in a molecule has the R-configuration and...
Figure 2: How many chiral carbons does this model have? a Does this model have a plane of symmetry? Rotate the central bond to see b. possible conformations before answering/ Yes No Make the mirror image model of this molecule. Are the mirror images identical? Yes No C. dl What is the term for the relationship between these structures? Are these structures chiral €or achiral? Switch two of the groups on one of the carbons of one model, resulting in...
9. C (Z-2-hexene d. They are all of equal stability. Choose the most stable alkene among the following a 1-hexene b. (E)-2-hexene 10. What is the relation between an enantiomer's configuration and its specific rotation? (a) Rcompounds usually are dextrorotatory with few exceptions (b) R compounds always are dextrorotatory. (c) There is no relation. (d) R compounds always are levorotatory 11. How many chiral centers are there in tartaric acid, and how many different stereoisomers exist for this acid? он...
19) How many of the following statements are true? i) Enantiomers are always chiral ii) A molecule that has a plane of symmetry can never be chiral. iii) An achiral molecule will always have an enantiomer. iv) A chiral molecule will always have an enantiomer v) Enantiomers are always nonsuperimposable a) 0 b) 1 c) 2 d) 3 e) 4 ab) 520. Identify the stereochemistry in each of the following compounds as R or S.Give the correct IUPAC name for the following compounds. For alkenes, when appropriate, indicate...
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