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How many isomers (constitutional and stereoisomers) exist for dimethylcyclopentane? A. 3

How many isomers (constitutional and stereoisomers) exist for dimethylcyclopentane? 
A. 3
B. 5
C. 7
D. 9

 

32. How many isomers (constitutional and stereoisomers) exist for dimethylpentane? 
A. 2
B. 3
C. 4
D. 5

 

33. Which of the following statements regarding optical rotation is not true? 
A. All (+) enantiomers are dextrorotatory.
B. All R enantiomers are dextrorotatory.
C. All (-) enantiomers rotate plane-polarized light in a counterclockwise direction.
D. All (+) and (-) enantiomers rotate plane-polarized light in opposite directions.

 

34. How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 20% of the S isomer? 
A. 1 g
B. 2 g
C. 4 g
D. 6 g

 

35. How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 60% of the R isomer? 
A. 2 g
B. 4 g
C. 6 g
D. 8 g

 

36. A solution containing 0.2 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +3?. What is the specific rotation of the R isomer? 
A. +0.6?
B. +15?
C. +67?
D. +150?

 

37. A solution containing 0.04 g/mL of a pure S enantiomer in a 1 dm polarimeter rotates plane polarized light by +2?. What is the specific rotation of the R isomer? 
A. -50?
B. -20?
C. +10?
D. +50?

 

38. A solution containing 0.2 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +2.8?. What is the rotation of a solution containing 0.4 g/mL of the R isomer in the same polarimeter? 
A. +0.7?
B. +1.4?
C. +2.8?
D. +5.6?

 

39. A solution of 0.1 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +4.8?. What is the rotation observed on this solution in a 2 dm polarimeter? 
A. +2.4?
B. +4.8?
C. +9.6?
D. +19.2?

 

40. A pure sample of the R enantiomer of a compound has a specific rotation, [a], of +20?. A solution containing 0.2 g/mL of a mixture of enantiomers rotates plane polarized light by -2? in a 1 dm polarimeter. What is the enantiomeric excess (%ee) of the mixture? 
A. 25% R
B. 40% S
C. 50% S
D. 70% R

Dec 10 2019 View more View Less

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