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Which of the following statements about meso compounds is not true?


A) A meso compound generally has a plane of symmetry.
B) A meso compound and its mirror image are identical.
C) A meso compound is achiral.
D) A meso compound is chiral.

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What is the relationship between the following compounds? What is the relationship between the following compounds? A) Constitutional isomers B) Diastereomers C) Enantiomers D) Identical


A) Constitutional isomers
B) Diastereomers
C) Enantiomers
D) Identical

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How many stereogenic centers are present in the following compound? How many stereogenic centers are present in the following compound? A) 1 B) 2 C) 3 D) 4


A) 1
B) 2
C) 3
D) 4

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B

What is the percent ee of a mixture that has 70% of one enantiomer and 30% of the other?


A) 70
B) 85
C) 40
D) 30

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How many stereogenic centers are present in menthol? How many stereogenic centers are present in menthol? A) 1 B) 2 C) 3 D) 4


A) 1
B) 2
C) 3
D) 4

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If a mixture has an ee of 90%, what is the percentage of each enantiomer?


A) 65% : 35%
B) 55% : 45%
C) 80% : 20%
D) 95% : 5%

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Which of the following compounds is a meso compound?


A) (2R, 3S) -dichlorobutane
B) (2R, 3R) -dichlorobutane
C) (2R, 3S) -3-chloro-2-butanol
D) (2R, 3R) -3-chloro-2-butanol

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How many stereoisomers are possible for a molecule with formula CH3CHBrCH(OH) CH3?


A) 1
B) 2
C) 3
D) 4

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Which of the following structures has a different configuration from the other three? Which of the following structures has a different configuration from the other three? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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What is the relationship between the following compounds? What is the relationship between the following compounds? A) Constitutional isomers B) Diastereomers C) Enantiomers D) Identical


A) Constitutional isomers
B) Diastereomers
C) Enantiomers
D) Identical

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How many chiral stereoisomers can be drawn for dimethycyclopropane?


A) 1
B) 2
C) 3
D) 4

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A reaction mixture is three parts of one enantiomer and one part of the other. What is the percent ee of this mixture?


A) 75
B) 40
C) 65
D) 50

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D

Which of the following structures has a different configuration from the other three? Which of the following structures has a different configuration from the other three? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system. −NH2−NHCH3−CH2NH2−CH2NHCH3 I  II  III  IV \begin{array} { c c c c } - \mathrm { NH } _ { 2 } & - \mathrm { NHCH } _ { 3 } & - \mathrm { CH } _ { 2 } \mathrm { NH } _ { 2 } & - \mathrm { CH } _ { 2 } \mathrm { NHCH } _ { 3 } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}


A) I > II > III > IV
B) II > I > IV > III
C) II > I > III > IV
D) I > II > IV > III

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How many stereogenic centers are present in ephedrine, a bronchodilator and decongestant? How many stereogenic centers are present in ephedrine, a bronchodilator and decongestant? A) 0 B) 1 C) 2 D) 3


A) 0
B) 1
C) 2
D) 3

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Which of the following is the definition for a pair of diastereomers?


A) A pair of stereoisomers with stereogenic centers which is not chiral.
B) A pair of stereoisomers that are superimposable mirror images of each other.
C) A pair of stereoisomers that are not superimposable mirror images of each other.
D) A pair of stereoisomers that are not mirror images of each other.

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How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 30% of the S isomer?


A) 3.0 g
B) 3.5 g
C) 6.5 g
D) 7.0 g

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B

Which of the following statements about starch and cellulose is true?


A) Starch and cellulose are not stereoisomers.
B) In cellulose, the O atom joins two rings using one equatorial and one axial bond.
C) In starch, the O atom joins two rings using two equatorial bonds.
D) In cellulose, the O atom joins two rings using two equatorial bonds.

Correct Answer

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What is the relationship between the following two compounds? What is the relationship between the following two compounds? A) Constitutional isomers B) Stereoisomers C) Identical D) Not isomers, different compounds


A) Constitutional isomers
B) Stereoisomers
C) Identical
D) Not isomers, different compounds

Correct Answer

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Which of the following statements is not true?


A) A molecule that is superimposable on its mirror image is said to achiral.
B) A molecule that is not superimposable on its mirror image is said to be chiral.
C) A molecule that is superimposable on its mirror image is said to be chiral.
D) A carbon atom bonded to four different groups is a stereogenic center.

Correct Answer

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