Which of the following are achiral conformers? A) staggered and ...

[Shelles]

Which of the following are achiral conformers?
  A)
  staggered and eclipsed forms of ethane
  B)
  cis and trans-2-butene
  C)
  meso and (2R,3R)-2,3-dibromobutane
  D)
  (R) and (S)-lactic acid

Question 2

Which of the three molecules below is a diastereomer of the following molecule?
   
   
   
   
   
   
  A)
  I
  B)
  II
  C)
  III
  D)
  there are no diastereomers
  E)
  both I and II

Question 3

Which of the three molecules below is the enantiomer of the following molecule?
   
   
   
   
   
   
  A)
  I
  B)
  II
  C)
  III
  D)
  there are no enantiomers
  E)
  both II and III

Question 4

Which of the following molecules are the same?
   
   
   
  A)
  1 and 2
  B)
  3 and 4
  C)
  1 and 3
  D)
  2 and 3
  E)
  2 and 4

Question 5

The observed rotation for 100 mL of an aqueous solution containing 1 g of sucrose, placed in a 2-decimeter sample tube, is +1.33 at 25C. What is the specific rotation of sucrose?
  A)
  +66.5
  B)
  +266
  C)
  +41.5
  D)
  +133
  E)
  108

Question 6

Which of the following statements about enantiomers is INCORRECT?
  A)
  they cannot be differentiated by spectra
  B)
  they have the same melting and boiling points
  C)
  the mirror image of the R enantiomer is the S enantiomer
  D)
  the specific rotation of enantiomers has the same magnitude
  E)
  without exception, S enantiomers will rotate plane-polarized light to the left (counterclockwise)

[laurnthompson]

Answer to Question 1

a

Answer to Question 2

c

Answer to Question 3

a

Answer to Question 4

c

Answer to Question 5

a

Answer to Question 6

e