Which of the following is not true of enantiomers? ()
A. They have the same melting point.
B. They have the same boiling point.
C. They have the same chemical reactivity with non-chiral reagents.
D. They have the same density.
E. They have the same specific rotation.
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How many stereoisomers exist with the following basic connectivity? () CH3CHClCH2CHClCH3
A. 0
B. 1
C. 2
D. 3
E. 4
Which of the statements below correctly describes an achiral molecule? ()
A. The molecule has a nonsuperimposable mirror image.
B. The molecule exhibits optical activity when it interacts with plane-polarized light.
C. The molecule has an enantiomer.
D. The molecule might be a meso form.
E. None of the above 12 Copyright © 2016 Pearson Education, Ltd.
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
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°
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