Question 1

What mass of (S)-(-)-mandelic acid is present in a 10 g sample which has an enantiomeric excess of 20% of the S-enantiomer?

Accepted Answer

The answer of What mass of (S)-(-)-mandelic acid is present...

Question 2

Which of the following structures is chiral?

Accepted Answer

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

Question 3

How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 20% of the S isomer?

Accepted Answer

A) 1 g 
B) 2 g 
C) 4 g 
D) 6 g 
A) 1 g 
B) 2 g 
C) 4 g 
D) 6 g

Question 4

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) "-NH2" 
B) "-NHCH3" 
C) "-CH2NH2" 
D) "-CH2NHCH3" 
A) "-NH2" 
B) "-NHCH3" 
C) "-CH2NH2" 
D) "-CH2NHCH3"

Question 5

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

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 6

Which of the following is the definition of a meso compound?

Accepted Answer

A) A molecule with stereocenter centers which is chiral 
B) A molecule with stereocenter centers which is not chiral 
C) A diastereomer with no stereocenter centers 
D) A chiral compound with more than one stereocenter center 
A) A molecule with stereocenter centers which is chiral 
B) A molecule with stereocenter centers which is not chiral 
C) A diastereomer with no stereocenter centers 
D) A chiral compound with more than one stereocenter center

Question 7

The specific rotation of the S-enantiomer of a compound is -120º. A student determines that a sample of the compound has a specific rotation of +60º. What mass of the S-enantiomer is present in 10 g of the sample

Accepted Answer

The answer of The specific rotation of the S-enantiomer of...

Question 8

How many chiral centers are there in the following molecule (the naturally occurring stereoisomer is camphor, a pungent moth repellent)?

Accepted Answer

A) Two 
B) Three 
C) Four 
D) Five 
A) Two 
B) Three 
C) Four 
D) Five

Question 9

The specific rotation of enantiomers have the same magnitude.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

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

Question 11

Of the compounds listed below, only 2 has a chiral centers.

Accepted Answer

A) True 
 B)False

Question 12

An unknown sample is tested with a polarimeter for optical activity. The results of the test required no movement of the analyzer. This sample could be either a meso compound or a racemic mixture.

Accepted Answer

A) True 
 B)False

Question 13

How many isomers (constitutional and stereoisomers) exist for dimethylpentane?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
A) 2 
B) 3 
C) 4 
D) 5

Exam 3: Stereoisomerism and Chirality

What mass of (S)-(-)-mandelic acid is present in a 10 g sample which has an enantiomeric excess of 20% of the S-enantiomer?

Which of the following structures is chiral?

How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 20% of the S isomer?

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

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

Which of the following is the definition of a meso compound?

The specific rotation of the S-enantiomer of a compound is -120º. A student determines that a sample of the compound has a specific rotation of +60º. What mass of the S-enantiomer is present in 10 g of the sample

How many chiral centers are there in the following molecule (the naturally occurring stereoisomer is camphor, a pungent moth repellent)?

The specific rotation of enantiomers have the same magnitude.

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

Of the compounds listed below, only 2 has a chiral centers.

An unknown sample is tested with a polarimeter for optical activity. The results of the test required no movement of the analyzer. This sample could be either a meso compound or a racemic mixture.

How many isomers (constitutional and stereoisomers) exist for dimethylpentane?

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

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