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Introduction


Definitions


Three-Dimensional Representations


Assigning Priorities


Determining Stereochemical Relationships


Question Sets


A project of the Chemical Education Digital Library
Question Sets: Testing Your Knowledge, Test 1


Choose the correct answer for each of the following 15 multiple choice questions relating to the overall content of this tutorial. Don't look back at the previous pages for the answers; instead, work out the answers based on what you remember. Then click Submit to check your answers and see brief explanations for the correct choices.

1. Which of the following three molecules is (are) achiral?


a. I only.
b. II only.
c. I and II.
d. I, II, and III.

2. How many chiral atoms does the following molecule have?


a. Three (3).
b. Four (4).
c. Five (5).
d. Six (6).

3. Will an equal mixture of the following two molecules cause a net rotation of plane-polarized light? (Assume that the molecule on the right will rotate light.)


a. Yes.
b. No.
c. This cannot be determined with the information given.

4. Which of the following terms best describes the following pair of molecules?


a. Isomers.
b. Constitutional isomers.
c. Configurational isomers.
d. Geometric isomers.

5. What is the relationship between the two groups in the following molecules?


a. They are equatorial to one another.
b. They are axial to one another.
c. They are cis to one another.
d. They are trans to one another.

6. Which group on the atom marked with an asterisk (*) has the highest priority in the molecule below?


a. The alcohol.
b. The chlorine.
c. The ethyl group.
d. The carboxylic acid group.

7. What is the spatial orientation of the double bond in the molecule below?


a. Cis.
b. Trans.
c. E.
d. Z.

8. What is the spatial orientation of the stereocenter marked with an asterisk (*) in the molecule below?


a. R.
b. S.
c. E.
d. Z.

9. In the molecule below, how many stereocenters have an S orientation?


a. Zero (0).
b. One (1).
c. Two (2).
d. Three (3).

10. What is the complete name of the molecule below, if the base name of the molecule is 3-bromo-5-isopropylcyclohexene?


a. (3,R)-bromo-(5,R)-isopropyl-Z-cyclohexene.
b. (3,S)-bromo-(5,S)-isopropyl-Z-cyclohexene.
c. (3,S)-bromo-(5,R)-isopropyl-E-cyclohexene.
d. (3,S)-bromo-(5,R)-isopropyl-Z-cyclohexene.

11. What is the stereochemical relationship between the following two molecules?


a. Identical.
b. Enantiomers.
c. Diastereomers.
d. None of the above.

12. What is the stereochemical relationship between the following two molecules?


a. Identical.
b. Enantiomers.
c. Diastereomers.
d. None of the above.

13. What is the stereochemical relationship between the following two molecules?


a. Identical.
b. Enantiomers.
c. Diastereomers.
d. None of the above.

14. What is the stereochemical relationship between the following two molecules?


a. Identical.
b. Enantiomers.
c. Diastereomers.
d. None of the above.

15. What is the stereochemical relationship between the following two molecules?


a. Identical.
b. Enantiomers.
c. Diastereomers.
d. None of the above.




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