Chapter 5: Q4. (page 180)
Draw in a plane of symmetry for each molecule.

a.

b.

c.

d.
Short Answer

a.

b.

c.

d.
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Chapter 5: Q4. (page 180)
Draw in a plane of symmetry for each molecule.

a.

b.

c.

d.

a.

b.

c.

d.
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The amino acid (S)-alanine has the physical characteristics listed under the structure.

a. What is the melting point of (R)-alanine?
b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine?
c. What is the specific rotation of (R)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine?
d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine?
e. Label each of the following as optically active or inactive: a solution of pure (S)-alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine.
Saquinavir (trade name Invirase) is a protease inhibitor, used to treat HIV (human immunodeficiency virus).

Which group in each pair is assigned the higher priority in R,S nomenclature?
What is the ee for each of the following mixtures of enantiomers A and B?
a. 95% A and 5% B
b. 85% A and 15% B
How is compound A related to compounds B–E? Choose from enantiomers, diastereomers, constitutional isomers, or identical molecules.

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