Question 1

Draw the structural formula for (R)-5-bromo-2,5-dimethyl-1,3-cyclopentadiene,clearly indicating stereochemical details.

Accepted Answer

The answer of Draw the structural formula for (R)-5-bromo-2,5-dimethyl-1,3-cyclopentadiene,clearly indicating...

Question 2

Which is not an example of resonance?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  None of these are examples of resonance. 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  None of these are examples of resonance. C

Question 3

Which of these dienes is the most reactive in the Diels-Alder reaction?

Accepted Answer

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

Question 4

The allyl radical has how many bonding $\pi$molecular orbitals?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 5

Stereochemically speaking,the Diels-Alder reaction is ___________ and occurs with ___________ of the dienophile stereochemistry.

Accepted Answer

stereospec

Question 6

The HOMO of the allylic radical has how many electrons 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 7

What is (are)the product(s)of the following reaction?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  a mixture of I and II 
E)  a mixture of II and III 
A)  I 
B)  II 
C)  III 
D)  a mixture of I and II 
E)  a mixture of II and III

Question 8

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

Accepted Answer

A)  the less stable product forms more rapidly. 
B)  the more stable product forms more rapidly. 
C)  product B will predominate at equilibrium. 
D)  the intermediate has a short lifetime. 
E)  No conclusions can be drawn as to either reaction rate or product stability. 
A)  the less stable product forms more rapidly. 
B)  the more stable product forms more rapidly. 
C)  product B will predominate at equilibrium. 
D)  the intermediate has a short lifetime. 
E)  No conclusions can be drawn as to either reaction rate or product stability.

Question 9

Which compound would have a UV absorption band at longest wavelength?

Accepted Answer

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

Question 10

Draw the structural formula for (2Z,4Z,6Z)-3,4,8-trimethyl-2,4,6-nonatriene,clearly indicating stereochemical details.

Accepted Answer

The answer of Draw the structural formula for (2Z,4Z,6Z)-3,4,8-trimethyl-2,4,6-nonatriene,clearly indicating...

Question 11

The allyl radical has how many electrons in bonding  $\pi$ molecular orbitals?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 12

Which carbocation would be least stable?

Accepted Answer

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

Question 13

Which of the following dieneophiles is most reactive in a 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 14

The hydrogen atom on a saturated (sp3)carbon adjacent to a double bond is called an ______________ hydrogen.

Accepted Answer

Question 15

Which pair does not represent a pair of resonance structures?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  All of these represent pairs of resonance structures. 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  All of these represent pairs of resonance structures.

Question 16

Which free radical would be most stable?

Accepted Answer

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

Question 17

Which diene and dienophile would you choose to synthesize the following compound?

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 18

Which diene and dienophile would you choose to synthesize the following compound?

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 19

Which is the major product of the following reaction?

Accepted Answer

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

Question 20

The allyl cation has how many electrons in bonding  $\pi$ molecular orbitals?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Exam 13: Conjugated Unsaturated Systems

Draw the structural formula for (R)-5-bromo-2,5-dimethyl-1,3-cyclopentadiene,clearly indicating stereochemical details.

Which is not an example of resonance?

Which of these dienes is the most reactive in the Diels-Alder reaction?

The allyl radical has how many bonding π\piπ molecular orbitals?

Stereochemically speaking,the Diels-Alder reaction is ___________ and occurs with ___________ of the dienophile stereochemistry.

The HOMO of the allylic radical has how many electrons in its ground state?

What is (are)the product(s)of the following reaction?

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

Which compound would have a UV absorption band at longest wavelength?

Draw the structural formula for (2Z,4Z,6Z)-3,4,8-trimethyl-2,4,6-nonatriene,clearly indicating stereochemical details.

The allyl radical has how many electrons in bonding π\piπ molecular orbitals?

Which carbocation would be least stable?

Which of the following dieneophiles is most reactive in a Diels-Alder reaction:

The hydrogen atom on a saturated (sp3)carbon adjacent to a double bond is called an ______________ hydrogen.

Which pair does not represent a pair of resonance structures?

Which free radical would be most stable?

Which diene and dienophile would you choose to synthesize the following compound?

Which diene and dienophile would you choose to synthesize the following compound?

Which is the major product of the following reaction?

The allyl cation has how many electrons in bonding π\piπ molecular orbitals?

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

The allyl radical has how many bonding $\pi$ molecular orbitals?

Stereochemically speaking,the Diels-Alder reaction is _ and occurs with _ of the dienophile stereochemistry.

The allyl radical has how many electrons in bonding $\pi$ molecular orbitals?

The hydrogen atom on a saturated (sp³)carbon adjacent to a double bond is called an ______________ hydrogen.

The allyl cation has how many electrons in bonding $\pi$ molecular orbitals?