mod 5 ch 5

Question 1

what is the equation to find the number of stereoisomers a molecule is capable of forming

Answer 1

2^n
where n = # of chiral centers

Question 2

define enantiomer

Answer 2

their R and S configurations are exactly opposite

Question 3

define diastereomer

Answer 3

they have at least one difference in their R and S configurations

Question 4

what are the three requirements to be a meso compound

Answer 4

1. must have two chiral centers
2. one must be R, one must be S
3. must have the same three groups off both of the chiral centers

Question 5

meso compounds are

Answer 5

achiral due to symmetry

Question 6

what things are optically inactive

Answer 6

• meso compounds
• racemic mixtures (50% each enantiomer cancels out)

Question 7

Answer 7

Question 8

to determine if a molecule is pro-R or pro-S

Answer 8

label the atom they are pointing to priority one and find R or S

Question 9

a positive rotation of light or in the clockwise direction is referred to as

Answer 9

dextrorotatory

Question 10

a negative rotation of light or in the counterclockwise direction is referred to as

Answer 10

levorotatory

Question 11

when determining re and si…

Answer 11

assign priorities
re: clockwise
si counterclockwise