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How many stereoisomers exist with the following basic connectivity? () CH3CHClCH2CHClCH3

A. 0
B. 1
C. 2
D. 3
E. 4

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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.

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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°

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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%

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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 mixture of equal amounts of two enantiomers ________. ()

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? ()

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. 0
B. 1
C. 2
D. 3
E. 4