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- the stereo center in this molecule is ___. a. R b. SDraw a model of ethane. Imagine rotating the C-C single bond. a. Is there a change in the relative positions of the different atoms as the C-C bond is rotated? Yes or No? b. Does the ethane molecule have more than one conformation? Yes or No?Classify the pairs of molecules as not the same molecule, structural isomers, diastereomers, enantiomers or identical. Circle any molecules that are not achiral (a) (b) (c) Br... H CI H H Br H H3C Br H. CI Br H Br CI I I Br" "H H Br H CH3 Cr Br
- How do we distinguish between constitutional, configurational, conformational, and enantiomers?6. Use the molecule below to answer the following questions. a) Name the following molecule. b) Why is it necessary to provide R or S designation in order to clearly communicate molecular structure for this molecule? c) How many stereoisomers of this molecule are possible? Which of them are enantiomers to each other? Which are diastereomers? SH ICNFor the molecule below, assign configurations (R or S) at C4, C5, and C6. C6 'OH OH C4 Но ОН C5 O C4: R; C5: R; and C6: R C4: S; C5: S; and C6: S C4: S; C5: R; and C6: R C4: R; C5: S; and C6: R C4: R; C5: S; and C6: S
- Using your model, construct an energy diagram to show the variation in the free energy of the molecule as the FRONT ATOM is rotated CLOCKWISE from 0º to 360º in 60º increments. In your energy diagram, you should clearly show the relative energies of each conformer.Which structure (or structures) represents (or represent) the enantiomer of the molecule below? I OCH 3 &&&* IV I III and IV ||| || OCH3 OH OCH 3 & II || Br III OCH3 H3CO/I IVF) Circle the letter corresponding to the relationship of each pair of structures: Identical (I), Conformers (C), Enantiomers (E) (enantiomers can have different conformations). FIRST... determine the absolute configuration of chiral centers. H. ІН' I H | H с H Me E Me
- H ...I II H I OH CH3 Draw the chair confirmation for these two structures.10. Draw the Newman projection of all the conformers for 4-aminohexan-3-ol (see structure below). Draw the Graph of the relative torsional energies for this molecule and assign each conformer to the related energy level and torsional angle NH₂ OH IConsider the derivative of cyclohexane A and its representation in chair conformation B: 7 3 H3C $1 Ń 4 9 1 2 Complete Structure B: 3 4 5 6 7 8 9 HO 10 AT Choose... H OH electron lone pair CH3 CH2OH Choose... Choose... Choose... Choose... F Choose... OH ◆ + ♦ ◆ H 10 B 6 5