Question 1

Show how the carbon p orbitals overlap to form the π2 molecular orbital of the allyl cation.

Accepted Answer

Question 2

What diene and dienophile would react to give the product below?

Accepted Answer

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

Question 3

Provide the two major organic products of the following reaction.

Accepted Answer

The answer of Provide the two major organic products of...

Question 4

How many nodes, other than the node coincident with the molecular plane, are present in the LUMO of 1,3,5-hexatriene?

Accepted Answer

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

Question 5

Provide the structure of the major organic product in the following reaction.

Accepted Answer

The answer of Provide the structure of the major organic...

Question 6

Dicylopentadiene results when cyclopentadiene reacts with itself in a Diels-Alder reaction. Provide the structure of dicyclopentadiene. Pay particular attention to stereochemical detail.

Accepted Answer

The answer of Dicylopentadiene results when cyclopentadiene reacts with itself...

Question 7

Provide a detailed, stepwise mechanism for the reaction shown below.

Accepted Answer

The answer of Provide a detailed, stepwise mechanism for the...

Question 8

Draw the s-trans conformation of (Z)-1,3-hexadiene.

Accepted Answer

The answer of Draw the s-trans conformation of (Z)-1,3-hexadiene....

Question 9

What descriptive term is applied to the type of diene represented by 2,4-hexadiene?

Accepted Answer

A)  conjugated diene 
B)  cumulated diene 
C)  isolated diene 
D)  alkynyl diene 
E)  none of the above 
A)  conjugated diene 
B)  cumulated diene 
C)  isolated diene 
D)  alkynyl diene 
E)  none of the above

Question 10

What diene and dienophile would react to give the product below?

Accepted Answer

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

Question 11

Provide the major organic product of the following reaction.

Accepted Answer

The answer of Provide the major organic product of the...

Question 12

Draw the HOMO of pentadienyl cation.

Accepted Answer

The answer of Draw the HOMO of pentadienyl cation....

Question 13

Which of the following molecules is chiral?

Accepted Answer

A)  1,2-pentadiene 
B)  2,3-pentadiene 
C)  2-methyl-2,3-pentadiene 
D)  2-chloro-4-methyl-2,3-pentadiene 
E)  None of the above molecules is chiral. 
A)  1,2-pentadiene 
B)  2,3-pentadiene 
C)  2-methyl-2,3-pentadiene 
D)  2-chloro-4-methyl-2,3-pentadiene 
E)  None of the above molecules is chiral.

Question 14

What diene and dienophile would react to give the product below?

Accepted Answer

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

Question 15

Explain why SN2 reactions on allyl bromide proceed faster than corresponding reactions on ethyl bromide.

Accepted Answer

When the substrate is allylic, resonance

Question 16

Which substrate would react most rapidly in an SN2 reaction?

Accepted Answer

A)  CH3CH2CH=CHCH2Br 
B)  BrCH2CH2CH=CHCH3 
C)  CH3CHBrCH=CH2CH3 
D)  CH3CH2CH2CH=CHBr 
A)  CH3CH2CH=CHCH2Br 
B)  BrCH2CH2CH=CHCH3 
C)  CH3CHBrCH=CH2CH3 
D)  CH3CH2CH2CH=CHBr

Question 17

Draw structures for the two major products of the following reaction.

Accepted Answer

The answer of Draw structures for the two major products...

Question 18

Provide the major organic product of the following reaction.

Accepted Answer

The answer of Provide the major organic product of the...

Question 19

What descriptive term is applied to the type of diene shown?

Accepted Answer

A)  conjugated diene 
B)  cumulated diene 
C)  isolated diene 
D)  alkynyl diene 
E)  none of the above 
A)  conjugated diene 
B)  cumulated diene 
C)  isolated diene 
D)  alkynyl diene 
E)  none of the above

Question 20

How many electrons are present in the nonbonding π molecular orbital of the allyl cation?

Accepted Answer

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

Exam 15: Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy

Show how the carbon p orbitals overlap to form the π2 molecular orbital of the allyl cation.

What diene and dienophile would react to give the product below?

Provide the two major organic products of the following reaction.

How many nodes, other than the node coincident with the molecular plane, are present in the LUMO of 1,3,5-hexatriene?

Provide the structure of the major organic product in the following reaction.

Dicylopentadiene results when cyclopentadiene reacts with itself in a Diels-Alder reaction. Provide the structure of dicyclopentadiene. Pay particular attention to stereochemical detail.

Provide a detailed, stepwise mechanism for the reaction shown below.

Draw the s-trans conformation of (Z)-1,3-hexadiene.

What descriptive term is applied to the type of diene represented by 2,4-hexadiene?

What diene and dienophile would react to give the product below?

Provide the major organic product of the following reaction.

Draw the HOMO of pentadienyl cation.

Which of the following molecules is chiral?

What diene and dienophile would react to give the product below?

Explain why SN2 reactions on allyl bromide proceed faster than corresponding reactions on ethyl bromide.

Which substrate would react most rapidly in an SN2 reaction?

Draw structures for the two major products of the following reaction.

Provide the major organic product of the following reaction.

What descriptive term is applied to the type of diene shown?

How many electrons are present in the nonbonding π molecular orbital of the allyl cation?

Introduction and Review

Structure and Properties of Organic Molecules

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides: Nucleophilic Substitution and Elimination

Structure and Synthesis of Alkenes

Reactions of Alkenes

Alkynes

Structure and Synthesis of Alcohols

Reactions of Alcohols

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Ethers, Epoxides, and Thioethers

Aromatic Compounds

Reactions of Aromatic Compounds

Ketones and Aldehydes

Amines

Carboxylic Acids

Carboxylic Acid Derivatives

Condensations and Alpha Substitutions of Carboxyl Compounds

Carbohydrates and Nucleic Acids

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

Show how the carbon p orbitals overlap to form the π₂ molecular orbital of the allyl cation.

Explain why S_N2 reactions on allyl bromide proceed faster than corresponding reactions on ethyl bromide.

Which substrate would react most rapidly in an S_N2 reaction?