Question 1

The reaction of 1,3-butadiene with hydrogen halide at 0°C will undergo _____ -addition under ____________ control.

Accepted Answer

The answer of The reaction of 1,3-butadiene with hydrogen halide...

Question 2

Which one of the following dienophiles is most reactive in the Diels-Alder reaction?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 3

Identify the MOs that react to form cyclohexene via a Diels-Alder Reaction.

Accepted Answer

A)  LUMO of 1,3-butadiene and HOMO of ethylene 
B)  LUMO of 1,3-butadiene and LUMO of ethylene 
C)  HOMO of 1,3-butadiene and HOMO of ethylene 
D)  HOMO of 1,3-butadiene and LUMO of ethylene 
A)  LUMO of 1,3-butadiene and HOMO of ethylene 
B)  LUMO of 1,3-butadiene and LUMO of ethylene 
C)  HOMO of 1,3-butadiene and HOMO of ethylene 
D)  HOMO of 1,3-butadiene and LUMO of ethylene

Question 4

Predict the major product for the following reaction.

Accepted Answer

The answer of Predict the major product for the following...

Question 5

Which diene and dienophile would react to give the following Diels-Alder product?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 6

Identify the color of a compound that absorbs yellow light.

Accepted Answer

A)  orange 
B)  green 
C)  red 
D)  blue 
E)  violet 
A)  orange 
B)  green 
C)  red 
D)  blue 
E)  violet

Question 7

Which diene and dienophile would react to give the following Diels-Alder product?

Accepted Answer

The answer of Which diene and dienophile would react to...

Question 8

How many electrons does the HOMO of 2,4-hexadiene have in its ground state?

Accepted Answer

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

Question 9

Which one of the following dienes will have the highest heat of hydrogenation?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 10

The addition of a _____________ bond improves the elasticity in synthetic rubber.

Accepted Answer

The answer of The addition of a _____________ bond improves...

Question 11

Predict the product for the following Diels-Alder reaction.

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 12

Absorption of UV-visible radiation by a molecule results in ___________ transitions.

Accepted Answer

A)  electronic 
B)  nuclear 
C)  rotational 
D)  vibrational 
E)  None of these 
A)  electronic 
B)  nuclear 
C)  rotational 
D)  vibrational 
E)  None of these

Question 13

Which one of the following represents the lowest energy $\pi$-bonding molecular orbital of 1,3-butadiene?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 14

Provide the reagents necessary to carry out the following conversion.

Accepted Answer

The answer of Provide the reagents necessary to carry out...

Question 15

Predict the major product for the following Diels-Alder reaction.

Accepted Answer

The answer of Predict the major product for the following...

Question 16

Which one of the following dienes is most stable?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 17

Dienes with alternate π and σ bonds are classified as ______.

Accepted Answer

A)  isolated 
B)  cumulated 
C)  skipped 
D)  conjugated 
E)  none of these 
A)  isolated 
B)  cumulated 
C)  skipped 
D)  conjugated 
E)  none of these

Question 18

Which of the following compounds has the shortest $\lambda$max?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 19

Both s-cis and s-trans conformers of 1,3-butadiene have a continuous conjugated $\pi$ system. Which of the following statements is true about the s-cis conformer?

Accepted Answer

A)  The s-cis conformer is lower in energy than the s-trans conformer 
B)  The s-cis conformer is higher in energy than the s-trans conformer 
C)  The s-cis conformer has equal energy as the s-trans conformer 
D)  none of these 
A)  The s-cis conformer is lower in energy than the s-trans conformer 
B)  The s-cis conformer is higher in energy than the s-trans conformer 
C)  The s-cis conformer has equal energy as the s-trans conformer 
D)  none of these

Question 20

How many electrons does the LUMO of 2,4-hexadiene have in its ground state?

Accepted Answer

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

Exam 16: Conjugated Pi Systems and Pericyclic Reactions

The reaction of 1,3-butadiene with hydrogen halide at 0°C will undergo _____ -addition under ____________ control.

Which one of the following dienophiles is most reactive in the Diels-Alder reaction?

Identify the MOs that react to form cyclohexene via a Diels-Alder Reaction.

Predict the major product for the following reaction.

Which diene and dienophile would react to give the following Diels-Alder product?

Identify the color of a compound that absorbs yellow light.

Which diene and dienophile would react to give the following Diels-Alder product?

How many electrons does the HOMO of 2,4-hexadiene have in its ground state?

Which one of the following dienes will have the highest heat of hydrogenation?

The addition of a _____________ bond improves the elasticity in synthetic rubber.

Predict the product for the following Diels-Alder reaction.

Absorption of UV-visible radiation by a molecule results in ___________ transitions.

Which one of the following represents the lowest energy π\piπ -bonding molecular orbital of 1,3-butadiene?

Provide the reagents necessary to carry out the following conversion.

Predict the major product for the following Diels-Alder reaction.

Which one of the following dienes is most stable?

Dienes with alternate π and σ bonds are classified as ______.

Which of the following compounds has the shortest λ\lambdaλ max?

Both s-cis and s-trans conformers of 1,3-butadiene have a continuous conjugated π\piπ system. Which of the following statements is true about the s-cis conformer?

How many electrons does the LUMO of 2,4-hexadiene have in its ground state?

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

The reaction of 1,3-butadiene with hydrogen halide at 0°C will undergo _ -addition under ________ control.

Which one of the following represents the lowest energy $\pi$ -bonding molecular orbital of 1,3-butadiene? $Which one of the following represents the lowest energy \pi -bonding molecular orbital of 1,3-butadiene?$

Which of the following compounds has the shortest $\lambda$ _max? $Which of the following compounds has the shortest \lambda <sub>max</sub>?$

Both s-cis and s-trans conformers of 1,3-butadiene have a continuous conjugated $\pi$ system. Which of the following statements is true about the s-cis conformer?