Ch 5: Stereochemistry

Question 1

Chiral Molecule

Answer 1

No mirror planes (axis of symmetry)

Question 2

Sterocenter / Chiral Center

Answer 2

Has 4 different groups attached

Question 3

One Stereocenter (except Amines)

Answer 3

Chiral

Question 4

Enantiomers

Answer 4

Nonsuperimposable Mirror Images

Question 5

Optically Active

Answer 5

Rotates in Polarized Light

Question 6

Levorotary

Answer 6

Rotates Counterclockwise in Polarized Light

Question 7

Dextrorotary

Answer 7

Rotates Clockwise in Polarized Light

Question 8

Racemic Mixture

Answer 8

Mixture with equal amounts of two chiral enantiomers

Question 9

What types of molecules are Optically Active?

Answer 9

Chiral molecules

Question 10

Is a Racemic Mixture Levo- or Dextrorotary?

Answer 10

Neither, it isn’t Optically Active

Question 11

Least Important Group is Back (Dashed)

Answer 11

R: Clockwise
S: Counterclockwise

Question 12

Least Important Group isn’t Back (Wedge or Line)

Answer 12

R: Counterclockwise
S: Clockwise

Question 13

Fischer Projection, Least Important Group is Vertical

Answer 13

R: Clockwise
S: Counterclockwise

Question 14

Fischer Projection, Least Important Group is Horizontal

Answer 14

R: Counterclockwise
S: Clockwise

Question 15

What types of molecules form Diastereomers?

Answer 15

Double Bond Isomers
Molecules with Multiple Stereocenters

Question 16

Mesocompounds

Answer 16

Achiral molecules with multiple stereocenters

Question 17

R-R vs R-S

Answer 17

Diastereomer

Question 18

S-S vs S-R

Answer 18

Diastereomer

Question 19

Achiral, S-S vs R-R

Answer 19

Mesocompound

Question 20

Chiral, S-S vs R-R

Answer 20

Enantiomer

Question 21

Chiral, S-R vs R-S

Answer 21

Enantiomer

Question 22

Achiral, R-S vs S-R

Answer 22

Mesocompound