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- Indicate a plane of symmetry for each molecule that contains one. A molecule may require rotation around a carbon–carbon bond to see the plane of symmetry.1. Determine if the molecules are chiral (meaning they have chiral centers and lack of plane of symmetry) in the following molecules. For molecules in Newman projections or chairs, it might be helpful to draw the sawhorse or perspective drawing first. NH2 H. CH3 a. b. H3C. C. H3C H CH3 OH NH2 d. e. f. HHow many stereoisomers estuary for this molecule? Show how you know. A. 8 B. 3 C. 4 D. 6
- Chemistrycapacity. How many stereocentres does the molecule contain? H .N. *H,N N. Select one: O a. one O b. two O c. three O d. four O e. nonea. b. For the following two pairs of molecules, (1) Draw out the chair conformation for each molecule, flip the ring if it is possible. (2) Compare both molecules to circle out which one is more stable. (3) Identify their relationship as: constitutional isomer, conformational isomer, stereoisomer or identical. (4) Find all the chiral center on each molecule and label them. Br.. Ax < and and H. H H Br H H
- The twist boat conformation is more stable than the boat conformation because a. the hydrogens are completely staggered b. the flagpole hydrogens are farther apart c. the hydrogens exhibit less torsional strain d. Both B and Ca. b. For the following two pairs of molecules, (1) Draw out the chair conformation for each molecule, flip the ring if it is possible. (2) Compare both molecules to circle out which one is more stable. (3) Identify their relationship as: constitutional isomer, conformational isomer, stereoisomer or identical. (4) Find all the chiral center on each molecule and label them. Br and ZX- and VS. H H H Br H H ∞STEREOCHEMISTRY View your right hand in front of the mirror. Which of the following statement/s is/areTRUE? I. Your left hand is the mirror image of your right hand. The reflection of your right hand is superimposable on your left hand. II. a. I only b. II only c. both I and II Which of the following pairs of objects are identical with each other, that is,superimposable mirror images? your left and your right hand two Erlenmeyer flasks two spheres with the same diameter III. IV. V. a. I only b. II only c. II and III only
- Sn1 or sn2?By first working out how many stereogenic centers are present in the following molecules, determine how many optical isomers exist Br. III.. OHDraw 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?
