Examine the models for the presence of a plane of symmetry. Present or Not present? CH3 CH3 CH3 NH, H,C- CH3 H2N NH2 H;C NH2 H;C- CH3 CH3 PH2 PH2 A C Which are superimposable on their mirror image? A, B, C ond/or D? Which model represents a chiral molecule? A, B, C and/or D?
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- a) Which structures are Enantiomers? b) Which structures are Diastereomers? c) Which structures are meso compounds? Use the letters only for your answers. А. В. H H CI H H Cl C. H H D. H Cl ČI Cl CI H1. _____ are molecules which contain both chirality centers and a plane of symmetry a. achiralb. chiralityc. optically actived. meso compounds 2. (-)-cholesterol ...a. does not have a chiral centerb. is dextrorotatoryc. rotates the plane of ploarized light counterclockwised. does not rotate polarized light 3. ___ are stereoisomers that are not mirror images.a. chiral centerb. enantiomersc. diastereomersd. racemates3. Give the relationship between the following molecules. Your options are enantiomers, diastereomers, or the same molecule. Determine R/S configurations of any chiral a. b. C. centers. H₂C-Si- H H CH3 COOH H -OH H-OH H -OH CH₂OH H₂ Br CH3 CO₂H Br H CH₂OH and HO H- HO H CH₂OH H -ОН H COOH and H₂C H H- Br Si CH3 CH3 CO₂H -Br -H CH2OH
- How many stereocenters are in the D-glucose molecule? a b. 2 . C 0 d 1 Clear my choice ROOM How many Rand S stereocenters are there in the 5-a Dihydrotestosterone molecule? a. 45, 38 b. 15, 6R C35, 4R d. 35, 3R e. 65 1R Clear my choice Total number of stereoisomers possible for the following compounds s O FORMIGA 0 270The configuration for the enantiomer shown above is a. R b. SAssign R/S configuration to all chiral centers in the molecule below: H3C. Et Br H₂N H NH₂ 11 H NH₂ Ill H Newman Projections: Assign R/S configuration to all chiral centers in the molecules below: Et. Et OH ㅎ.... CN CH3 CH3 H OH OH H. H CH3 CH3 NH₂ OHThe specific rotation for a pure enantiomer is known to be -45 g- mL-1 dm-1. A sample containing both enantiomers is found to have an observed rotation of -0.50° in a 1dm tube at a concentration of 4.2g/100 mL. What is the optical purity of the sample? O a. 20.6% Ob. 30.8% Oc. 26.4% O d. 36.5%1. An object is chiral if it A. is superimposable on its mirror image B. is not superimposable on its mirror image C. has no mirror image D. is identical to each mirror image of itselfAtomic #'s & Masses: Carbon: 6, 12.01g/mole Oxygen: 8, 16.00g/mole H: 1, 1.01g/mole 4. Answer questions for the following molecule: a. Circle any/all chiral centers. b. Is the molecule chiral or achiral. H H CH₂ CH₂ Br Br3. Indicate if the following molecule has an Ror S configuration. CH3 HOIC CH2CH3 Atomic #'s & Masses: Carbon: 6, 12.01g/mol Oxygen: 8, 16.00g/mol H: 1, 1.01g/mol 4. Answer questions for the following molecule: a. Circle any/all chiral centers. b. Is this molecule chiral or achiral. ICI CIWhich of the following pairs of structures represent a pair of enantiomers? a. b. C. d. O a O b Oc C Od H3C... H Br C HC NC H3CH₂C COOH H... C CN CH3 Br HC H₂N CH3 OH COOH CN HC-CH3 Br Br H.C. HOOC OH H... C H₂C CN H3C C H₂N CH₂CH3 COOH H4. For each pair of molecules, assign the configuration at each chiral center as R or S. Give the relationship between the pair of molecules as no relation, constitutional isomers, same molecule but not meso, same molecule and meso, enantiomers, or diastereomers. There should only be one possible answer. a. OH OH b. Br Br с. NH2 NH2 NH2 NH2 d. HO НО