Carbohydrate Stereoisomers and Structures

Question 1

define chiral carbon

Answer 1

carbon with 4 different roots attached

Question 2

what is the formula to determine the number of chiral carbons in an aldose?

Answer 2

total C - 2 = n

Question 3

what is the formula to determine the number of chiral carbons in a ketose?

Answer 3

total C - 3 = n

Question 4

what is the formula to determine the total number of stereoisomers in a carbohydrate?

Answer 4

2^n
(n= # chiral carbons)

Question 5

what is the formula to determine naturally occurring stereoisomers?

Answer 5

total/2

Question 6

draw the structure of D- glyceraldehyde.
Is this a ketose or aldose?

Answer 6

aldose

Question 7

draw the structure of dihydroxyacetone.
Is this a ketose or aldose?

Answer 7

ketose

Question 8

draw the structure of L-erythrose.
is this a ketose or aldose?

Answer 8

aldose

Question 9

draw the structure of D-erythrose.
is this a ketose or aldose?

Answer 9

aldose

Question 10

draw the structure of D-ribose.
is this a ketose or aldose?

Answer 10

aldose

Question 11

draw the structure of L-ribose.
is this a ketose or aldose?

Answer 11

aldose

Question 12

draw the structure of D-ribulose.
is this a ketose or aldose?

Answer 12

ketose