5.63 How is compound A related to compounds B-E? Choose from enantiomers, diastereomers, constitutional isomers, or identical molecules. NH2 NH2 NH2 NH2 NH2 B C D E

Which of the following is an enantiomer of the compound below? . II Н Н Br Н Select one: O A. IV O B. II ос. III O D. I Н Br CH₂CH3 CH3 CH3 ОН Br CH₂CH3 -ОН Н CH₂CH3 ОН -Н CH3 11 IV НО- Н Н HO CH2CH3 -Н CH3 Br CH₂CH3 CH3 Br Н

Which compound has the lowest pk₂? A) C) B) D)

Chemistry 5.66 A mixture contains equal amounts of compounds A-D. D B C A a. Which compounds alone are optically active? b. If the mixture was subjected to fractional distillation, how many fractions would be obtained? c. How many of these fractions would be optically active?