Question 1

Which of the following relationships is not valid as applied to ultraviolet-visible spectroscopy?

Accepted Answer

A) "A = log (Io/I)" 
B) "A = $\varepsilon$cl" 
C) "$\Delta$E = hv" 
D) "A = $\lambda$maxl" 
A) "A = log (Io/I)" 
B) "A = $\varepsilon$cl" 
C) "$\Delta$E = hv" 
D) "A = $\lambda$maxl" D

Question 2

Consider the reaction below to answer the following question(s):   Enter the appropriate letter in the blank for each the following statements.
-The nucleophile in this reaction is ____.

Accepted Answer

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

Question 3

What are the units of $\varepsilon$ in ultraviolet-visible spectroscopy?

Accepted Answer

A) M-1.cm-1 
B) M.cm 
C) J.mol-1.M-1 
D) none,  $\varepsilon$ is a dimensionless quantity 
A) M-1.cm-1 
B) M.cm 
C) J.mol-1.M-1 
D) none,  $\varepsilon$ is a dimensionless quantity A

Question 4

Consider the following reaction.   This is an example of a sigmatropic reaction with a [3,3]-shift.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following processes takes place upon absorption of ultraviolet-visible radiation?

Accepted Answer

A) bond vibration 
B) electron excitation 
C) nuclear spin flip 
D) electron spin flip 
A) bond vibration 
B) electron excitation 
C) nuclear spin flip 
D) electron spin flip

Question 6

What is (are) the major organic product(s) formed in the following reaction?

Accepted Answer

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

Question 7

Consider the reaction below to answer the following question(s).   Fill in the blank in the question with the appropriate letter.
-The diene in the reaction is ____.

Accepted Answer

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

Question 8

What range of wavelengths corresponds to the ultraviolet region of the electromagnetic spectrum?

Accepted Answer

A) 200-400 nm 
B) 400-700 nm 
C) 2.5-25 $\mu$m 
D) 2-10 mm 
A) 200-400 nm 
B) 400-700 nm 
C) 2.5-25 $\mu$m 
D) 2-10 mm

Question 9

Which of the following arrangements of p atomic orbitals of 1,3-butadiene has the greatest number of nodes?

Accepted Answer

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

Question 10

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?

Accepted Answer

1,3-Cyclohexadiene, in which t

Question 11

What is (are) the major organic product(s) formed in the following reaction?

Accepted Answer

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

Question 12

Which of the following has the highest value of $\lambda$max in the ultraviolet-visible spectrum?

Accepted Answer

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

Question 13

Which of the following are conjugated dienes?

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 14

Consider the following reaction.   This is an example of a sigmatropic reaction with a [3,3]-shift.

Accepted Answer

A) True 
 B)False

Question 15

What is the IUPAC name of the following compound?

Accepted Answer

A) 2,3-dimethyl-2,4-pentadiene 
B) (Z)-2,3-dimethyl-2,4-pentadiene 
C) 3,4-dimethyl-1,3-pentadiene 
D) (Z)-3,4-dimethyl-1,3-pentadiene 
A) 2,3-dimethyl-2,4-pentadiene 
B) (Z)-2,3-dimethyl-2,4-pentadiene 
C) 3,4-dimethyl-1,3-pentadiene 
D) (Z)-3,4-dimethyl-1,3-pentadiene

Question 16

Consider the reaction below to answer the following question(s):   Enter the appropriate letter in the blank for each the following statements.
-Consider the following spectrum for a conjugated diene.   If a similar spectrum were taken for a conjugated tetraene, the $\lambda$max would be _________than 217 nm.

Accepted Answer

Question 17

Which of the following arrangements of p atomic orbitals gives the highest energy $\pi$-antibonding molecular orbital of 1,3-butadiene?

Accepted Answer

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

Question 18

Which of the following are conjugated dienes?

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 19

What is the reactive intermediate in the reaction of 1,3-butadiene with HBr resulting in 1,2-addition?

Accepted Answer

A) cyclic bromonium cation 
B) allylic cation 
C) allylic radical 
D) dienophile 
A) cyclic bromonium cation 
B) allylic cation 
C) allylic radical 
D) dienophile

Question 20

What is the kinetic product obtained from the addition of 1 mole of bromine to 1,3-butadiene?

Accepted Answer

A) 3,4-dibromo-1-butene 
B) (
E) -1,4-dibromo-2-butene 
C) (Z)-1,4-dibromo-2-butene 
D) (Z)-2,3-dibromo-2-butene 
A) 3,4-dibromo-1-butene 
B) (
E) -1,4-dibromo-2-butene 
C) (Z)-1,4-dibromo-2-butene 
D) (Z)-2,3-dibromo-2-butene

Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

Which of the following relationships is not valid as applied to ultraviolet-visible spectroscopy?

Consider the reaction below to answer the following question(s): Enter the appropriate letter in the blank for each the following statements. -The nucleophile in this reaction is ____.

What are the units of ε\varepsilonε in ultraviolet-visible spectroscopy?

Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

Which of the following processes takes place upon absorption of ultraviolet-visible radiation?

What is (are) the major organic product(s) formed in the following reaction?

Consider the reaction below to answer the following question(s). Fill in the blank in the question with the appropriate letter. -The diene in the reaction is ____.

What range of wavelengths corresponds to the ultraviolet region of the electromagnetic spectrum?

Which of the following arrangements of p atomic orbitals of 1,3-butadiene has the greatest number of nodes?

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?

What is (are) the major organic product(s) formed in the following reaction?

Which of the following has the highest value of λ\lambdaλ max in the ultraviolet-visible spectrum?

Which of the following are conjugated dienes?

Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

What is the IUPAC name of the following compound?

Which of the following arrangements of p atomic orbitals gives the highest energy π\piπ -antibonding molecular orbital of 1,3-butadiene?

Which of the following are conjugated dienes?

What is the reactive intermediate in the reaction of 1,3-butadiene with HBr resulting in 1,2-addition?

What is the kinetic product obtained from the addition of 1 mole of bromine to 1,3-butadiene?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

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

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

What are the units of $\varepsilon$ in ultraviolet-visible spectroscopy?

Which of the following has the highest value of $\lambda$ _max in the ultraviolet-visible spectrum? $Which of the following has the highest value of \lambda <sub>max</sub> in the ultraviolet-visible spectrum?$

Which of the following arrangements of p atomic orbitals gives the highest energy $\pi$ -antibonding molecular orbital of 1,3-butadiene? $Which of the following arrangements of p atomic orbitals gives the highest energy \pi -antibonding molecular orbital of 1,3-butadiene?$