Chem 341, Quiz #9B 20 points total Your score:_____of 20. Date: 11/9
Name (Last, First): ________________________________________P # : _______________
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Your
answer
1.
Which of the following compounds 1-4 is not chiral?
Cl
F
CO2H
HO2C
Cl
F3 C
Ph
Cl
2
1
A) 3;
2.
B) 4 ; C) 2 ;
OH
Cl
CF3
F
CHO
HO2C
Ph
3
C
OH
4
D) 1
Which of the following compounds is a meso-form?
1
2
3
4
5
CF3
F
CF3
CF3
CF3
CF3
CF3
F3 C
CF3
CF3
CF3
CF3
F3 C
CF3
A
CF3
F3 C
CF3
CF3
A) only 4 B) only 5 C) only 1; D) only 1 and 5
3.
Which of the following is correct Fischer projections of the compound on the left?
1
Cl
CH=O
CH=O
H
CH3
H
Cl
2
CH=O
3
CH=O
4
H3C
H
H
CH3 Cl
H
Cl
H
Cl
H
H
CH=O
A) 3; B) 4 ; C) 2 ; D) 1
4.
C
What is (are) the major organic product(s) obtained from the following reaction?
C
1 (2R,3R)-dichlorobutane
2 (2S,3S)-dichlorobutane
3 meso-2,3-dichlorobutane
A) only 2; B) only 1; C) only 1 and 2; D) only 3
5.
Which of the following structures represent the same stereoisomer?
D
A) only 1 and 2; B) 1, 2 and 3; C) only 1 and 3; D) only 2 and 3
CHEM341 Quiz #9, page 1
6.
What is (are) the major organic product(s) obtained from the following reaction?
D
1 (2R,3R)-3-bromo-2-butanol
2 (2R,3S)-3-bromo-2-butanol
3 (2S,3R)-3-bromo-2-butanol
4 (2S,3S)-3-bromo-2-butanol
A) 1, 2, 3 and 4; B) only 2 and 3; C) only 1 and 2; D) only 1 and 4
7.
What is (are) the major organic product(s) obtained from the following reaction?
B
1 (2R,3R)-dibromobutane
2 (2S,3S)-dibromobutane
3 meso-2,3-dibromobutane
A) only 2; B) only 3; C) only 1; D) only 1 and 2
8.
Which of the following compounds 1-4 are enantiomers?
F
1
CF3
CF3
2
CF3
H
F
H
Et
CH2CF3
CH3
4
3 CF3
H
H
F3C
H
H
F
H
H
CH2CF3
H
Et
H
F
CH3
H
H
H
CF3
H
F
H
H
B
CF3
CF3
A) only 2; B) only 3; C) only 1; D) only 1 and 2
9.
Which of the following compounds is a meso compound?
A) (2R,3R)-3-bromo-2-butanol
B) (2R,3S)-3-bromo-2-butanol
C) (2R,3S)-difluorobutane
D) (2R,3R)-difluorobutane
10
C
Which of the following is the definition of a meso compound?
A) A diastereomer with two chirality centers that has a plane of symmetry
B) A molecule with two identical chirality centers
C) A chiral compound with more than one chirality center
D) A molecule with chirality centers which is not achiral
11
A
Which of the following structures is not chiral?
1
3
2
F
4
CF3
F
F3C
A) 3; B) 1 ; C) 4 ; D) 2
12
F3C
H
COOH
OMe
How many stereoisomers of 2,3-dichlorobutane exist?
D
A) 1; B) 2 ; C) 4 ; D) 3
13
A
How many stereoisomers of 3-bromo-2-fluorobutane exist?
A
A) 4; B) 3 ; C) 2 ; D) 1
CHEM341 Quiz #9, page 2
14
Which of the following R/S assignment is correct?
1
2
F3C
3
4
HO
CH3
F
H
A) 1-S, 2-R, 3-S, 4-S;
15
F
COOH
B) 1-S, 2-R, 3-S, 4-R ;
C) 1-S, 2-R, 3-R, 4-S ;
CH3
A
F
D) 1-R, 2-R, 3-S, 4-S
Which of the following have the R configuration?
1
2
F
Cl
3
F
Ph
Ph
H
H
4
H
F
D
D
Cl
H
A) 1, 2 and 4; B) only 1 and 2; C) only 1; D) only 4; E) only 1 and 3
16
Which of the following is the definition of chirality?
A) The superimposability of an object on its mirror image;
B) A molecule that has a carbon atom with four different substituents ;
C) The non-superimposability an object on its mirror image ;
D) A molecule with a mirror image
17
Which of the following statements is the most accurate regarding the reactions of (R)-4-methyl-1-hexene?
A) The reaction with HBr results in a racemic mixture.
B) The reaction with HBr results in a mixture of diastereomers.
C) The reaction with HBr results in a mixture of unequal amounts of two diastereomers.
D) The reaction with HBr results in a mixture of unequal amounts of two enantiomers.
18
C
Which of the following is the definition of a pair of diastereomers?
A) Any pair of enantiomers with two chiral centers
B) A pair of stereoisomers each of which has two chirality centers
C) A pair of stereoisomers with two different chiral centers
D) A pair of stereoisomers with two chiral centers that are not-enantiomers
19.
C
D
Which of the following have the S configuration?
C
A) only 1; B) only 2; C) only 1 and 2; D) 1, 2 and 3
20.
Which of the following statements is true?
A) All molecules that have chirality centers are chiral
B) Superimposable structures are enantiomers
C) All compounds with mirror images are enantiomers
D) Isomers that are not superimposable on their mirror images are enantiomers
CHEM341 Quiz #9, page 3
D