(a). Draw all possible stereoisomers for each compound. (i). (ii). а Br т (7 marks) (b). Label pairs of enantiomers, diastereomers and/or meso compound in (a). (5 marks)

How to identify constitutional isomers from stereoisomers? Can you provide an example? With molecular formula if it's possible?

Organic Chemistry, Ch.4, WS #2, Stereochemistry - Review of R&S configuration, Fischer Projections, Enantiomers, Diastereomers, Meso Compounds. 1. Assign R or S configuration to each stereocenter. (a) H₂C H₂C a H- H OH CH₂CH₂ - Br CH, (b) 2. For each Fischer Projection, assign R or S configuration. CH₂ CH₂CH₂ b. H₂N- H COOH + -H CH₂ C-OH (c) HTC OH CH₂OH C. Br- CH₂OH CI CHO CH

On the molecule below, highlight all R stereocenters in red and all S stereocenters in blue. If it doesn't contain any stereocenters, check the "No Stereocenters" box under the drawing area. H Ś

II. Indicate the correct correlation between the following pairs of molecules. Write the appropriate letter in the box. S = Same Compound, E = Enantiomers, D = Diastereomers, and C = Constitutional Isomers. (? Br CI CI Br 7. and 8. 9. and and Br "Br CI CH3 CI CH3 HBr and CH H- Br and 11. 10. Br Br -H CH,CH3 CH,CH3

19) Draw Fischer projections for the following molecules HO H C₂H5 H CI Cillim H J H "!!!!IOH Brill Br OHC COOH HO 20) Draw all possible stereoisomers for 2,3-dihydroxybutane and label any meso compounds.

5. Draw the Fisher projection for these compounds. Draw its mirror image then assign R or S configuration. Determine whether they are enantiomers. OH OH HO2C OH OH •CH2OH