2. Indicate whether the compounds in each of the following pairs are identical, enantiomers, diastereomers, or constitutional isomers, and assign the absolute configuration for each structure. HC=CH2 CH,CH, CH, H C. CH₂OH b. H CH₂ y CH, H CH₂CH3 CH₂OH HO H CH₂ -H -CI CH3 y y CH₂CH3 H CH₂ HC=CH, CH₂CH, CH, -OH -H CH₂ e. f. CI H 11 CH₂ H H

How are the following two compounds related? CH3 CH3 HO H HO H -H Select one: OH H -OH CH₂OH A. Diastereomers vs B. Conformers C. Identical compounds D. Enantiomers O E. Constitutional isomers HO H H HO -H -OH -OH -H CH₂OH

Assign E or Z configuration to the following alkenes: CH, H Co,H HN- NC. H. CH;OH H,NH,C CH3 A B A = E B = E, Z A = Z B = E, E A = E B = E A = Z B = E, Z A =Z B = E

Which Fischer projection (A-D) correctly represents the bondline structure below? OH А. Н- Н О А CH3 H -OH OH Н В. НО- Н CH3 .... OH -H OH – НО Н С. CH3 Н -H OH D. НО- НО- CH3 Н H -H

identify whether the two structures in each pair represents enantiomets or two molecules of the same compound in different orientation.

4. What are the stereocenter assignments for the two molecules below? OH CH,CH, H,C-C-CH(CH32 HC=CH2 a. S, S b. R, R c. S, R d. R, S 5. Which of the following compounds has the highest boiling point? a. 4-methylpentanal b. 2-methyl-3-pentanol c. 3-methyl-2-pentanone d. 2-fluoro-4-methylpentane 6. How many chiral center(s) is/are there in this molecule? a. one b. two c. three d. none с. 1

12. The following two structures represent: 14. The following two structures represent: H H H H HO-Ċ-H C=0 c=0 H-C-OH 0=¢ H-C-OH H-C-OH H-Ç-OH Но -с—н H-C-OH HO-Ç-H HO-C-H H H H-Ç-OH c=0 H a) diastereomers b) identical compounds c) enantiomers d) structural isomers a) diastereomers b) identical compounds c) enantiomers d) structural isomers 15. A chiral carbon atom must be 13. The following two structures represent: connected by: a) one triple bond and one single bond b) two double bonds c) one double bond and two single bonds H H c=0 Ċ=0 d) four single bonds H-C-OH H-Ċ-OH 16. Which of the following statements best describes stereoisomers? a) two or more compounds having the same molecular formula Но -с —н H-C-OH b) two or more compounds with the same molecular formula having different structural arrangements c) two or more compounds having the same molecular formula and the same structural arrangement but differ in their spatial arrangement d) two or more compounds having the same…