Question 1

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Accepted Answer

The answer of Which of the following terms best describes...

Question 2

Which of the following is not true of enantiomers?

Accepted Answer

A) They have the same melting point. 
B) They have the same boiling point. 
C) They have the same chemical reactivity with non-chiral reagents. 
D) They have the same density. 
E) They have the same specific rotation. 
A) They have the same melting point. 
B) They have the same boiling point. 
C) They have the same chemical reactivity with non-chiral reagents. 
D) They have the same density. 
E) They have the same specific rotation.

Question 3

(-)-Mandelic acid has a specific rotation of -158°.What would be the specific rotation of a solution which contains 40% (-)-mandelic acid and 60% (+)-mandelic acid?

Accepted Answer

A) +95° 
B) +63° 
C) +32° 
D) -32° 
E) -63° 
A) +95° 
B) +63° 
C) +32° 
D) -32° 
E) -63°

Question 4

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Accepted Answer

The answer of Which of the following terms best describes...

Question 5

Can one predict whether a compound with a single asymmetric center is dextro- or levorotatory based on the R/S assignment at this asymmetric center? Explain briefly.

Accepted Answer

No.R/S assignment is purely a

Question 6

Draw a enantiomer of the α-pinene present in juniper berry that is used to flavor gin.

Accepted Answer

The answer of Draw a enantiomer of the α-pinene present...

Question 7

Determine the E/Z and R,S configuration for 7,8-dihydrovomifoliol which is responsible for the fruity aroma of champagne.

Accepted Answer

The answer of Determine the E/Z and R,S configuration for...

Question 8

How many stereoisomers exist with the following basic connectivity? CH3CHClCH2CHClCH3

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 9

What is the relationship between the structures shown below?

Accepted Answer

A) enantiomers 
B) diastereomers 
C) configurational isomers 
D) identical compounds 
E) constitutional isomers 
A) enantiomers 
B) diastereomers 
C) configurational isomers 
D) identical compounds 
E) constitutional isomers

Question 10

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Accepted Answer

The answer of Which of the following terms best describes...

Question 11

The configuration of R-(+)-glyceraldehyde is as follows:   What is the absolute configuration of (-)-lactic acid?

Accepted Answer

A) R configuration 
B) L configuration 
C) S configuration 
D) R and S configuration 
E) D and L configuration 
A) R configuration 
B) L configuration 
C) S configuration 
D) R and S configuration 
E) D and L configuration

Question 12

Identify all pairs of enantiomers.

Accepted Answer

A) B and D,A and C 
B) A and C 
C) B and D 
D) A and B,A and D,B and C,C and D 
E) B and D,A and B,A and D,B and C,C and D 
A) B and D,A and C 
B) A and C 
C) B and D 
D) A and B,A and D,B and C,C and D 
E) B and D,A and B,A and D,B and C,C and D

Question 13

Is the molecule shown chiral? Is it a meso compound?

Accepted Answer

The answer of Is the molecule shown chiral? Is it...

Question 14

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Accepted Answer

The answer of Which of the following terms best describes...

Question 15

Identify all configurational isomers.

Accepted Answer

A) B and D,A and C 
B) A and C 
C) B and D 
D) A and B,A and D,B and C,C and D 
E) B and D,A and B,A and D,B and C,C and D 
A) B and D,A and C 
B) A and C 
C) B and D 
D) A and B,A and D,B and C,C and D 
E) B and D,A and B,A and D,B and C,C and D

Question 16

Assign an R or S configurational label to each asymmetric center in the molecule below.

Accepted Answer

The answer of Assign an R or S configurational label...

Question 17

Which of the following compounds is chiral?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 18

Consider the molecules with molecular formula C2H2Br2Cl2.
(a)Draw a structure that is optically inactive because it does not have an asymmetric center.
(b)Draw a structure that is optically inactive because it is a meso compound.
(c)Draw a structure that is optically active because it is chiral.

Accepted Answer

(a) @#IMG-DLM& no chirality ce

Question 19

Provide a careful structure for (2S,3R)-2,3-dibromohexane.

Accepted Answer

The answer of Provide a careful structure for (2S,3R)-2,3-dibromohexane....

Question 20

A solution containing 0.96 g of 2-bromooctane in 10 mL ether solution gave an observed rotation of -1.8° in a 10 cm cell at 20°C.Calculate the specific rotation of this solution.

Accepted Answer

[α] @#IMG-DLM& = @#IMG-DLM& [α

Exam 4: Isomers: the Arrangement of Atoms in Space

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Which of the following is not true of enantiomers?

(-)-Mandelic acid has a specific rotation of -158°.What would be the specific rotation of a solution which contains 40% (-)-mandelic acid and 60% (+)-mandelic acid?

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Can one predict whether a compound with a single asymmetric center is dextro- or levorotatory based on the R/S assignment at this asymmetric center? Explain briefly.

Draw a enantiomer of the α-pinene present in juniper berry that is used to flavor gin.

Determine the E/Z and R,S configuration for 7,8-dihydrovomifoliol which is responsible for the fruity aroma of champagne.

How many stereoisomers exist with the following basic connectivity? CH3CHClCH2CHClCH3

What is the relationship between the structures shown below?

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

The configuration of R-(+)-glyceraldehyde is as follows: What is the absolute configuration of (-)-lactic acid?

Identify all pairs of enantiomers.

Is the molecule shown chiral? Is it a meso compound?

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Identify all configurational isomers.

Assign an R or S configurational label to each asymmetric center in the molecule below.

Which of the following compounds is chiral?

Consider the molecules with molecular formula C2H2Br2Cl2. (a)Draw a structure that is optically inactive because it does not have an asymmetric center. (b)Draw a structure that is optically inactive because it is a meso compound. (c)Draw a structure that is optically active because it is chiral.

Provide a careful structure for (2S,3R)-2,3-dibromohexane.

A solution containing 0.96 g of 2-bromooctane in 10 mL ether solution gave an observed rotation of -1.8° in a 10 cm cell at 20°C.Calculate the specific rotation of this solution.

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

Radicals

Mass Spectrometry,infrared Spectroscopy,and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Amino Acids,peptides,and Proteins

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of the Metabolic Pathways

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

How many stereoisomers exist with the following basic connectivity? CH₃CHClCH₂CHClCH₃