Question 1

Which of the following structures is different from the other three?

Accepted Answer

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

Question 2

A natural product having [$\alpha$]D = +40.3$\circ$ has been isolated and purified. Either of the following substances could be this natural product.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following substituents has the highest priority according to the Cahn-Ingold-Prelog system used in assigning R and S configurations?

Accepted Answer

A) "-COOH" 
B) "-CHO" 
C) "-CH2OH" 
D) "-CH3" 
A) "-COOH" 
B) "-CHO" 
C) "-CH2OH" 
D) "-CH3"

Question 4

How many stereoisomers of 4-chloro-2-methylpentane (CH3)2CHCH2CHClCH3, exist?

Accepted Answer

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

Question 5

The process that separates enantiomers is called ______________.

Accepted Answer

The answer of The process that separates enantiomers is called...

Question 6

What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking) 
1.-C-CH
2.-CH2NH2
3.-NHCH3
4)-CN

Accepted Answer

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

Question 7

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

Accepted Answer

A) A pair of structures that are superposable mirror images of one another 
B) A pair of stereoisomers that are non-superposable mirror images of one another 
C) A pair of stereoisomers that are not mirror images of one another 
D) A pair of stereoisomers that have equal specific rotations 
A) A pair of structures that are superposable mirror images of one another 
B) A pair of stereoisomers that are non-superposable mirror images of one another 
C) A pair of stereoisomers that are not mirror images of one another 
D) A pair of stereoisomers that have equal specific rotations

Question 8

Which of the following compounds is/are chiral?

Accepted Answer

A) only 1 
B) only 1 and 2 
C) only 2 and 3 
D) 1, 2 and 3 
A) only 1 
B) only 1 and 2 
C) only 2 and 3 
D) 1, 2 and 3

Question 9

______________ are stereoisomers that are not mirror images.

Accepted Answer

Diastereom

Question 10

Which of the following Newman projections represents (2R,3R)-dibromobutane?

Accepted Answer

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

Question 11

Which of the following structures does not have a plane of symmetry?

Accepted Answer

A) only 2 
B) only 1 and 2 
C) only 3 and 4 
D) only 1, 2 and 4 
A) only 2 
B) only 1 and 2 
C) only 3 and 4 
D) only 1, 2 and 4

Question 12

The following structures depicts (__)-3-ethyl-2,3-dimethylhexane.

Accepted Answer

The answer of The following structures depicts (__)-3-ethyl-2,3-dimethylhexane.  ...

Question 13

How many stereoisomers of 2,4-dimethylpentane, (CH3)2CHCH2CH(CH3)2, exist?

Accepted Answer

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

Question 14

Complete the following diagram so that it represents (S)-2-butanol.

Accepted Answer

The answer of Complete the following diagram so that it...

Question 15

Complete the following zig-zag structure so that it represents (2R,3S)-3-chlorobutan-2-ol.

Accepted Answer

The answer of Complete the following zig-zag structure so that...

Question 16

Complete the following Newman projection so that it represents (2R,3S)-2,3-dibromobutane.

Accepted Answer

The answer of Complete the following Newman projection so that...

Question 17

The absolute configurations around C-2 and C-3 in the following Fischer projection are, respectively, ____. (Enter the two configurations separated by a comma.)

Accepted Answer

The answer of The absolute configurations around C-2 and C-3...

Question 18

How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 60% of the R isomer?

Accepted Answer

A) 2 g 
B) 4 g 
C) 6 g 
D) 8 g 
A) 2 g 
B) 4 g 
C) 6 g 
D) 8 g

Question 19

Which of the following have the S configuration?

Accepted Answer

A) only 1 
B) only 2 
C) only 1 and 2 
D) 1, 2 and 3 
A) only 1 
B) only 2 
C) only 1 and 2 
D) 1, 2 and 3

Question 20

Which of the following is the definition of chirality?

Accepted Answer

A) The non-superposability of an object on its mirror image 
B) The superposability of an object on its mirror image 
C) A molecule that has a carbon atom with four different substituents 
D) A molecule with a mirror image 
A) The non-superposability of an object on its mirror image 
B) The superposability of an object on its mirror image 
C) A molecule that has a carbon atom with four different substituents 
D) A molecule with a mirror image

Exam 3: Stereoisomerism and Chirality

Which of the following structures is different from the other three?

A natural product having [ α\alphaα ]D = +40.3 ∘\circ∘ has been isolated and purified. Either of the following substances could be this natural product.

Which of the following substituents has the highest priority according to the Cahn-Ingold-Prelog system used in assigning R and S configurations?

How many stereoisomers of 4-chloro-2-methylpentane (CH3)2CHCH2CHClCH3, exist?

The process that separates enantiomers is called ______________.

What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking) 1.-C-CH 2.-CH2NH2 3.-NHCH3 4)-CN

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

Which of the following compounds is/are chiral?

______________ are stereoisomers that are not mirror images.

Which of the following Newman projections represents (2R,3R)-dibromobutane?

Which of the following structures does not have a plane of symmetry?

The following structures depicts (__)-3-ethyl-2,3-dimethylhexane.

How many stereoisomers of 2,4-dimethylpentane, (CH3)2CHCH2CH(CH3)2, exist?

Complete the following diagram so that it represents (S)-2-butanol.

Complete the following zig-zag structure so that it represents (2R,3S)-3-chlorobutan-2-ol.

Complete the following Newman projection so that it represents (2R,3S)-2,3-dibromobutane.

The absolute configurations around C-2 and C-3 in the following Fischer projection are, respectively, ____. (Enter the two configurations separated by a comma.)

How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 60% of the R isomer?

Which of the following have the S configuration?

Which of the following is the definition of chirality?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

How many stereoisomers of 4-chloro-2-methylpentane (CH₃)₂CHCH₂CHClCH₃, exist?

What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking) 1.-C-CH 2.-CH₂NH₂ 3.-NHCH₃ 4)-CN

How many stereoisomers of 2,4-dimethylpentane, (CH₃)₂CHCH₂CH(CH₃)₂, exist?