题目内容

A mixture of equal amounts of two enantiomers ________. ()

A. is called a racemic mixture
B. is optically inactive
C. implies that the enantiomers are meso forms
D. both A and B
E. none of the above

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The specific rotation of a pure substance is 1.68°. What is the specific rotation of a mixture containing 75% of this isomer and 25% of the (-) isomer? ()

A. +1.68°
B. 0°
C. +1.26°
D. +0.84°
E. +.042°

The specific rotation of a pure substance is -5.90°. What is the percentage of this isomer in a mixture with an observed specific rotation of -2.95°? ()

A. 25%
B. 50%
C. 75%
D. 80%
E. 0%

(-)-Mandelic acid has a specific rotation of -158°. What would be the specific rotation of a solution which contains 40% (-)-mandelic acid and 60% (+)-mandelic acid? ()

A. +95°
B. +63°
C. +32°
D. -32°
E. -63°

A and B are stereoisomers. They are nonsuperimposable and are mirror images of one another. Which of the following best describes the relationship between A and B? ()

A. structural isomers
B. enantiomers
C. conformational isomers
D. diastereomers
E. constitutional isomers