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Flashcards in Chapter 5 Deck (13):
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

B) constitutional isomers

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

B) constitutional isomers

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.

E) It has an enantiomer.

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

C) enantiomers

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

D) The molecule might be a meso form.

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

D) all of the above

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.

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

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

E) both B and C

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

D) diastereomers

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

D) diastereomers

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

D) all of the above

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

D) diastereomers

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

E) none of the above