CHEM2581
Unit 2 Assignment Questions
Answer the following questions using this word document, and then submit to Blackboard.
1. Complete the following diagram so that it represents (R)-2-bromobutane.
2. Complete the following Fischer diagram so that it represents (2R,3R)-butane-2,3-diol.
3. Complete the following zig-zag structure so that it represents (2R,3R)-3-chlorobutan-2-ol.
4. Complete the following Newman projection so that it represents (2R,3S)-2,3-dibromobutane.
5. What mass of (S)-(–)-mandelic acid is present in a 10 g sample which has an enantiomeric excess of
30% of the S-enantiomer?
6. How can enantiomers be separated using chromatography?
7. What is the value of the equilibrium constant for the following equilibrium?
8. Provide a brief explanation, based on features of the molecules, for the following trend in pKa values?
CH3CH2OH > CH3COOH
15.9
4.76
9. Use curved arrows to show the movement of pairs of electrons in the following reaction between a
Lewis acid and a Lewis base, and show the structure of the product.
10. Use curved arrows to show the movement of pairs of electrons in the following reaction between a
Lewis acid and a Lewis base, and show the structure of the product.