Chapter 5

Question 1

What term describes the structural relationship between cis-1,2-dimethylcyclopentane and trans-1,3-dimethylcyclopentane?
A) not isomers
B) constitutional isomers
C) enantiomers
D) diastereomers
E) conformers

Answer 1

B) constitutional isomers

Question 2

What term describes the structural relationship between (2R,3R,4S)-2,3,4-trichloroheptane and (2S,3S,5R)-2,3,5-trichloroheptane?
A) not isomers
B) constitutional isomers
C) enantiomers
D) diastereomers
E) conformers

Answer 2

B) constitutional isomers

Question 3

Which of the following incorrectly describes cis-1,2-dimethylcyclopentane?
A) It is a meso compound.
B) It is achiral.
C) It contains two asymmetric carbons.
D) Its diastereomer is trans-1,2-dimethylcyclopentane.
E) It has an enantiomer.

Answer 3

E) It has an enantiomer.

Question 4

What term describes the structural relationship between (2R,3R,4S)-2,3,4-trichloroheptane and (2S,3S,4R)-2,3,4-trichloroheptane?
A) not isomers
B) constitutional isomers
C) enantiomers
D) diastereomers
E) conformers

Answer 4

C) enantiomers

Question 5

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

Answer 5

D) The molecule might be a meso form.

Question 6

Which of the following statements is (are) true for the compound (R)-2-butanol?
A) This compound is chiral.
B) This compound is optically active.
C) This compound has an enantiomer.
D) all of the above
E) none of the above

Answer 6

D) all of the above

Question 7

Which of the following statements correctly pertains to a pair of enantiomers?
A) They rotate the plane of polarized light by exactly the same amount and in opposite directions.
B) They rotate the plane of polarized light by differing amounts and in opposite directions.
C) They rotate the plane of polarized light by differing amounts and in the same direction.
D) The have different melting points.
E) They have the same melting point, but they have different boiling points.

Answer 7

A) They rotate the plane of polarized light by exactly the same amount and in opposite directions.

Question 8

Which of the following terms correctly describe(s) the structural relationship between cis-1,3-dimethylcyclopentane and trans-1,3-dimethylcyclopentane?
A) enantiomers
B) diastereomers
C) geometric isomers
D) both A and C
E) both B and C

Answer 8

E) both B and C

Question 9

What term describes the structural relationship between (E)- and (Z)-2-pentene?
A) not isomers
B) constitutional isomers
C) enantiomers
D) diastereomers
E) conformers

Answer 9

D) diastereomers

Question 10

What term describes the structural relationship between cis-1,2-dimethylcyclopentane and trans-1,2-dimethylcyclopentane?
A) not isomers
B) constitutional isomers
C) enantiomers
D) diastereomers
E) conformers

Answer 10

D) diastereomers

Question 11

Which of the following statements is (are) true for the compound (3R, 4R)-3,4-dimethylhexane?
A) This compound is chiral.
B) The enantiomer of this compound is (3S, 4S)-3,4-dimethylhexane.
C) This compound is a diastereomer of (3R, 4S)-3,4-dimethylhexane.
D) all of the above
E) none of the above

Answer 11

D) all of the above

Question 12

hat term describes the structural relationship between (2R,3R,4S)-2,3,4-trichloroheptane and (2R,3R,4R)-2,3,4-trichloroheptane?
A) not isomers
B) constitutional isomers
C) enantiomers
D) diastereomers
E) conformers

Answer 12

D) diastereomers

Question 13

Which of the following statements is (are) true for the compound cis-1,2-dichlorocyclopropane?
A) This compound is chiral.
B) The enantiomer of this compound is trans-1,2-dichlorocyclopropane.
C) This compound contains no asymmetric carbons.
D) all of the above
E) none of the above

Answer 13

E) none of the above