chapter 5

Question 1

enantimers vs. diastereomers

Answer 1

enantiomers - SI that are nonsuperimposable mirror images

diastereomers - SI that are not mirror images (ex: cis and trans)

Question 2

achiral vs chiral

Answer 2

achiral - plane of sym., no SC, superimposable

chiral - not super imposable, SC, enantiomers, no plane of sym.

Question 3

optically active vs. optically inactive

Answer 3

active - contains chiral compound
ex: 50% meso + 50% diastereomer = optically active

inactive -

1. achiral compound w/no SC
2. meso comound - achiral w/ 2+ SC’s
3. racemic mixture - equal amount of two enantiomers

Question 4

R and S to determine sterochemistry

Answer 4

enantiomer - ex: R,R –> R,S

diastereomer - ex: R,S –> S,S

Question 5

physical properties:
CI
enantiomers
diastereomers
racemic mixture

Answer 5

CI - different

enantiomers - identical except for direction of polarized light is rotated

diastereomers - different

racemic mixture - possibly different from either enantiomer