Carbohydrate Stereoisomers + Structures

Question 1

Define chiral carbon

Answer 1

C w/ 4 different groups attached

Question 2

What is the formula for # of chiral Cs in an ALDOSE

Answer 2

Aldose chiral Cs = Cs - 2

Question 3

What is the formula for # of chiral Cs in a KETOSE

Answer 3

Ketose chiral Cs = Cs - 3

Question 4

What is the formula for total # of stereoisomers in a carb

Answer 4

Total # stereoisomers = 2^n
n = # chiral carbons

Question 5

What is the formula to determine # naturally occurring stereoisomers

Answer 5

naturally occurring stereoisomers = total stereoisomers / 2

Question 6

Draw/recognize ALDOSE (D-glyceraldehyde)

Answer 6

Question 7

Draw/recognize KETOSE (dihydroxyacetone)

Answer 7

Question 8

Name/recognize L-ERYTHROSE vs D-ERYTHROSE

Answer 8

Question 9

Name/recognize D-RIBOSE vs L-RIBOSE

Answer 9

Question 10

Name/recognize D-RIBULOSE

Answer 10

Question 11

Name/recognize GLUCOSE

Answer 11

Question 12

Name/recognize MANNOSE

Answer 12

Question 13

Name/recognize GALACTOSE

Answer 13

Question 14

Name/recognize FRUCTOSE

Answer 14

Question 15

Name the ALDOSE TRIOSE

Answer 15

Glyceraldehyde

Question 16

How many chiral Cs are in a TRIOSE ALDOSE; how many total stereoisomers; how many naturally occurring stereoisomers?

Answer 16

1 chiral carbon, 2 stereoisomers, 1 naturally occurring stereoisomers

Question 17

Draw an ALDOSE TRIOSE

Answer 17

D-glyceraldehyde

Question 18

Name the KETOSE TRIOSE

Answer 18

Dihydroxyacetone

Question 19

How many chiral Cs in a TRIOSE KETOSE, total stereoisomers, naturally occurring stereoisomers?

Answer 19

0 chiral carbons, 1 stereoisomer, 1 naturally occurring stereoisomers

Question 20

Draw the structure of the TRIOSE KETOSE

Answer 20

Dihydroxyacetone

Question 21

Name an ALDOSE TETROSE

Answer 21

Erythrose

Question 22

How many chiral Cs in a TETROSE ALDOSE, total stereoisomers, naturally occurring stereoisomers?

Answer 22

2 chiral carbons, 4 stereoisomers, 2 naturally occurring stereoisomers

Question 23

Draw the structure of an ALDOSE TETROSE

Answer 23

D-Erythrose

Question 24

Name an ALDOSE PENTOSE

Answer 24

Ribose

Question 25

How many chiral Cs for an ALDOSE PENTOSE, total stereoisomers, naturally occurring stereoisomers?

Answer 25

3 chiral carbons, 8 stereoisomers, 4 naturally occurring stereoisomers

Question 26

Draw the structure of PENTOSE ALDOSE

Answer 26

D- Ribose

Question 27

Name a KETOSE PENTOSE

Answer 27

D-ribulose

Question 28

Name 3 ALDOSE HEXOSES

Answer 28

D-glucose, D-mannose, D-galactose

Question 29

How many chiral Cs in a HEXOSE ALDOSE, total stereoisomers, naturally occurring stereoisomers?

Answer 29

4 chiral carbons, 16 stereoisomers, 8 naturally occurring stereoisomers

Question 30

Draw the structure of a HEXOSE ALDOSE

Answer 30

D-allose

Question 31

Name a KETOSE HEXOSE

Answer 31

Fructose