Reduction of which of the following aldoses provides an optically ...

[Ebrown]

Reduction of which of the following aldoses provides an optically active alditol?
   
 
   
  A)
  1
  B)
  2
  C)
  3
  D)
  1 and 2
  E)
  3 and 4

Question 2

The configurations at C2, C3, and C4 of
   
   
   
   
  are:
  A)
  2R, 3R, 4R
  B)
  2R, 3S, 4R
  C)
  2S, 3R, 4S
  D)
  2S, 3R, 4R
  E)
  2R, 3S, 4S

Question 3

A Newman projection formula for
   
   
   
   
  is:
  A)
   
 
  D)
   
 
  B)
   
 
  E)
   
 
  C)
   
 

Question 4

The term that best describes the relationship between
   
   
   
   
   
  is
  A)
  conformers.
  B)
  epimers.
  C)
  enantiomers.
  D)
  meso forms.
  E)
  constitutional isomers.

Question 5

The equilibrium rotation of an aqueous solution of a and bD-glucose is +50, and the rotations of the pure a and b forms are +102 and +24, respectively.
  Assuming no other forms are present, the percent a form at equilibrium is:
  A)
  66.7
  B)
  50.0
  C)
  22.5
  D)
  33.3
  E)
  24.0

Question 6

Oxidation of optically active D-erythrose with nitric acid produces optically inactive meso-tartaric acid (below). What is the structure of D-erythrose?
   
   
   
   
   
   
  A)
   
 
  D)
   
 
  B)
   
 
  E)
   
 
  C)
   
 

Question 7

The difference between a and b-glucopyranose is:
  A)
  the stereochemistry at the anomeric carbon
  B)
  the number of carbons in the ring
  C)
  the position of all the OH's on the ring
  D)
  all of these reasons
  E)
  none of these reasons

[ktidd]

Answer to Question 1

a

Answer to Question 2

b

Answer to Question 3

d

Answer to Question 4

b

Answer to Question 5

d

Answer to Question 6

b

Answer to Question 7

a