Question 1

Based on the following spectrum,what is the energy in kilojoules per mole of photons that corresponds to the λmax?

Accepted Answer

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

Question 2

Draw: 2-methyl-1,3-butadiene

Accepted Answer

The answer of Draw: 2-methyl-1,3-butadiene...

Question 3

​Draw the mechanism of the bromination of 2-ethyl-1,3-pentadiene.

Accepted Answer

​

Question 4

Exhibit 14-7
Consider the reaction below to answer the following question(s).  
-Refer to Exhibit 14-7.The diene in the reaction is ____.

Accepted Answer

The answer of Exhibit 14-7
Consider the reaction below to answer...

Question 5

What is the concentration of a solution of a plant pigment (ε = 37,500) if an Absorbance of 0.751 were obtained in a cell with a 5.00 cm path length?

Accepted Answer

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

Question 6

Electrophilic addition reaction of conjugated dienes that occur at high temperature and/or long reaction times (reversible conditions) are said to be under:

Accepted Answer

A) 1,2-control 
B) kinetic control 
C) 1,4-control 
D) thermodynamic control 
A) 1,2-control 
B) kinetic control 
C) 1,4-control 
D) thermodynamic control

Question 7

​Calculate the concentration of β-carotene in a sample which is placed in a cell with a pathlength of 1.0 cm and the UV absorbance reads 0.56.The molar absorbtivity of β-carotene is found to be 138,000 L mol-1 cm-1.

Accepted Answer

Question 8

Draw: (2Z,4Z)-hexadiene

Accepted Answer

The answer of Draw: (2Z,4Z)-hexadiene...

Question 9

A physical constant that is the quantitative measure of the amount of UV light absorbed by a compound.

Accepted Answer

A) A 
B) ε 
C) λmax 
D) π* 
A) A 
B) ε 
C) λmax 
D) π*

Question 10

Exhibit 14-2
Consider the reaction below to answer the following question(s):  
-Refer to Exhibit 14-2.The nucleophile in this reaction is ____.

Accepted Answer

The answer of Exhibit 14-2
Consider the reaction below to answer...

Question 11

Name:

Accepted Answer

(3E)-2-met

Question 12

Consider the following spectrum for a conjugated diene.   If a similar spectrum were taken for a conjugated tetraene,the λmax would be:

Accepted Answer

A) close to 217 nm 
B) less than 217 nm 
C) greater than 217 nm 
A) close to 217 nm 
B) less than 217 nm 
C) greater than 217 nm

Question 13

​Draw the mechanism of the bromination of 1,3-pentadiene and indicate the major and minor products.

Accepted Answer

The answer of ​Draw the mechanism of the bromination of...

Question 14

In 1839,Charles Goodyear discovered a process by which both natural and synthetic rubbers are hardened.This process is called:

Accepted Answer

A) diazotization 
B) vulcanization 
C) polymerization 
D) condensation 
A) diazotization 
B) vulcanization 
C) polymerization 
D) condensation

Question 15

For Diels-Alder cycloaddition reactions to take place most rapidly and in highest yield the dienophile must:

Accepted Answer

A) be substituted with electron-withdrawing groups 
B) be able to adopt an s-trans conformation 
C) be substituted with electron-donating groups 
D) be able to adopt an s-cis conformation 
A) be substituted with electron-withdrawing groups 
B) be able to adopt an s-trans conformation 
C) be substituted with electron-donating groups 
D) be able to adopt an s-cis conformation

Question 16

​The unit for molar absorptivity is:

Accepted Answer

A) ​L/cm 
B) ​(L .mol)/cm 
C) ​L/(mol .cm) 
D) ​mol/L 
A) ​L/cm 
B) ​(L .mol)/cm 
C) ​L/(mol .cm) 
D) ​mol/L

Question 17

Which of the following compounds will react as a diene in a Diels-Alder reaction?

Accepted Answer

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

Question 18

Which of the following arises from π to π* transitions?

Accepted Answer

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

Question 19

Name:

Accepted Answer

2,3,4,5-te

Question 20

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation.High energy radiation like gamma rays is of:

Accepted Answer

A) low frequency and short wavelength 
B) low frequency and long wavelength 
C) high frequency and short wavelength 
D) high frequency and long wavelength 
A) low frequency and short wavelength 
B) low frequency and long wavelength 
C) high frequency and short wavelength 
D) high frequency and long wavelength

Exam 14: Conjugated Compounds and Ultraviolet Spectroscopy

Based on the following spectrum,what is the energy in kilojoules per mole of photons that corresponds to the λmax?

Draw: 2-methyl-1,3-butadiene

​Draw the mechanism of the bromination of 2-ethyl-1,3-pentadiene.

Exhibit 14-7 Consider the reaction below to answer the following question(s). -Refer to Exhibit 14-7.The diene in the reaction is ____.

What is the concentration of a solution of a plant pigment (ε = 37,500) if an Absorbance of 0.751 were obtained in a cell with a 5.00 cm path length?

Electrophilic addition reaction of conjugated dienes that occur at high temperature and/or long reaction times (reversible conditions) are said to be under:

​Calculate the concentration of β-carotene in a sample which is placed in a cell with a pathlength of 1.0 cm and the UV absorbance reads 0.56.The molar absorbtivity of β-carotene is found to be 138,000 L mol-1 cm-1.

Draw: (2Z,4Z)-hexadiene

A physical constant that is the quantitative measure of the amount of UV light absorbed by a compound.

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.The nucleophile in this reaction is ____.

Name:

Consider the following spectrum for a conjugated diene. If a similar spectrum were taken for a conjugated tetraene,the λmax would be:

​Draw the mechanism of the bromination of 1,3-pentadiene and indicate the major and minor products.

In 1839,Charles Goodyear discovered a process by which both natural and synthetic rubbers are hardened.This process is called:

For Diels-Alder cycloaddition reactions to take place most rapidly and in highest yield the dienophile must:

​The unit for molar absorptivity is:

Which of the following compounds will react as a diene in a Diels-Alder reaction?

Which of the following arises from π to π* transitions?

Name:

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation.High energy radiation like gamma rays is of:

Structure and Bonding

Polar Covalent Bonds;acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Par 1

Alkenes: Structure and Reactivity

Alkenes: Reactions and Synthesis

Alkynes: an Introduction to Organic Synthesis

Organohalides

Reactions of Alkyl Halides: Nucleophilic Substitutions and Eliminations

Par 2

Structure Determination: Mass Spectrometry and Infrared Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Par 3

Benzene and Aromaticity

Chemistry of Benzene: Electrophilic Aromatic Substitution

Alcohols and Phenols

Ethers and Epoxides;thiols and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Par 4

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution Reactions

Carbonyl Condensation Reactions

Par 5

Amines and Heterocycles

Biomolecules: Carbohydrates

Biomolecules: Amino Acids,peptides,and Proteins

Par 7

Biomolecules: Lipids

Biomolecules: Nucleic Acids

The Organic Chemistry of Metabolic Pathways

Orbitals and Organic Chemistry: Pericyclic Reactions

Synthetic Polymers

Par 1

Filters

Based on the following spectrum,what is the energy in kilojoules per mole of photons that corresponds to the λ_max?

Draw the mechanism of the bromination of 2-ethyl-1,3-pentadiene.

Calculate the concentration of β-carotene in a sample which is placed in a cell with a pathlength of 1.0 cm and the UV absorbance reads 0.56.The molar absorbtivity of β-carotene is found to be 138,000 L mol^-1 cm^-1.

Consider the following spectrum for a conjugated diene. If a similar spectrum were taken for a conjugated tetraene,the λ_max would be:

Draw the mechanism of the bromination of 1,3-pentadiene and indicate the major and minor products.

The unit for molar absorptivity is: