Question 1

Which of the following reactions releases the least amount of heat upon hydrogenation?

Accepted Answer

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

Question 2

How many electrons are in the given molecule's largest conjugated π system?

Accepted Answer

A) Four 
B) Five 
C) Six 
D) Eight 
E) Ten 
A) Four 
B) Five 
C) Six 
D) Eight 
E) Ten

Question 3

How many electrons are in the following molecule's largest conjugated π system?

Accepted Answer

A) Two 
B) Four 
C) Six 
D) Eight 
E) Ten 
A) Two 
B) Four 
C) Six 
D) Eight 
E) Ten

Question 4

Use the Frost method to explain whether furan,diagramed below is aromatic,antiaromatic,or nonaromatic.In your Frost diagram,fill in all π electrons,and label the HOMO and the LUMO.

Accepted Answer

Furan is aromatic,be

Question 5

How many different π systems does the following molecule contain?

Accepted Answer

The molecu

Question 6

Which is more acidic,HA or HB? Explain.

Accepted Answer

H_B is more acidic.When H_B is rem

Question 7

Which one of the following compounds is aromatic?

Accepted Answer

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

Question 8

Which hydrogen has the lowest Pka?

Accepted Answer

A) HA 
B) HB 
C) HC 
D) HD 
E) HE 
A) HA 
B) HB 
C) HC 
D) HD 
E) HE

Question 9

Which term can be used to define a molecule that is cyclic,planar,completely conjugated,and has four π electrons.

Accepted Answer

A) Aromatic 
B) Antiaromatic 
C) Nonaromatic 
D) Semiaromatic 
E) None of the above 
A) Aromatic 
B) Antiaromatic 
C) Nonaromatic 
D) Semiaromatic 
E) None of the above

Question 10

How many different π systems does the following molecule contain? Give the number of electrons in each.

Accepted Answer

There are two π syst

Question 11

Which of the following reactions releases the least amount of heat upon hydrogenation?

Accepted Answer

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

Question 12

Rank the three following molecules by the amount of heat released upon hydrogenation (from lowest amount to highest amount).Explain your answer.

Accepted Answer

Molecule I releases the least heat upon

Question 13

How many areas of constructive overlap are in the following atomic orbital contributor?

Accepted Answer

A) Zero 
B) One 
C) Two 
D) Three 
E) Four 
A) Zero 
B) One 
C) Two 
D) Three 
E) Four

Question 14

Which number of π electrons can be defined as an anti-Hückel number?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 22 
A) 0 
B) 1 
C) 2 
D) 3 
E) 22

Exam 16: Orbital Interactions 2: Extended Π Systems,conjugation,and Aromaticity

Which of the following reactions releases the least amount of heat upon hydrogenation?

How many electrons are in the given molecule's largest conjugated π system?

How many electrons are in the following molecule's largest conjugated π system?

Use the Frost method to explain whether furan,diagramed below is aromatic,antiaromatic,or nonaromatic.In your Frost diagram,fill in all π electrons,and label the HOMO and the LUMO.

How many different π systems does the following molecule contain?

Which is more acidic,HA or HB? Explain.

Which one of the following compounds is aromatic?

Which hydrogen has the lowest Pka?

Which term can be used to define a molecule that is cyclic,planar,completely conjugated,and has four π electrons.

How many different π systems does the following molecule contain? Give the number of electrons in each.

Which of the following reactions releases the least amount of heat upon hydrogenation?

Rank the three following molecules by the amount of heat released upon hydrogenation (from lowest amount to highest amount).Explain your answer.

How many areas of constructive overlap are in the following atomic orbital contributor?

Which number of π electrons can be defined as an anti-Hückel number?

Atomic and Molecular Structure

Interchapter: Nomenclature 1-4

Interchapter 1molecular Orbital Theory and Chemical Reactions

Three-Dimensional Geometry,intermolecular Interactions,and Physical Properties

Orbital Interactions 1: Hybridization and Two-Center Molecular Orbitals

Isomerism 1: Conformational and Constitutional Isomers

Isomerism 2: Chirality,enantiomers,and Diastereomers

The Proton Transfer Reaction: an Introduction to Mechanisms,thermodynamics,and Charge Stability

An Overview of the Most Common Elementary Steps

An Introduction to Multistep Mechanisms: Sn1 and E1 Reactions

Nucleophilic Substitution and Elimination Reactions 1: Competition Among Sn2,sn1,e2,and E1 Reactions

Nucleophilic Substitution and Elimination Reactions 2: Reactions That Are Useful for Synthesis

Electrophilic Addition to Nonpolar Π Bonds 1: Addition of a Brønsted Acid

Electrophilic Addition to Nonpolar Π Bonds 2: Reactions Involving Cyclic Transition States

Organic Synthesis 1: Beginning Concepts

Structure Determination 1: Ultravioletvisible and Infrared Spectroscopies

Structure Determination 2: Nuclear Magnetic Resonance Spectroscopy and Mass Spectrometry

Nucleophilic Addition to Polar Π Bonds 1: Addition of Strong Nucleophiles

Nucleophilic Addition to Polar Π Bonds 2: Addition of Weak Nucleophiles and Acid and Base Catalysis

Organic Synthesis 2: Intermediate Topics in Synthesis Design,and Useful Reduction and Oxidation Reactions

Nucleophilic Additionelimination Reactions 1: the General Mechanism Involving Strong Nucleophiles

Nucleophilic Additionelimination Reactions 2: Weak Nucleophiles

Electrophilic Aromatic Substitution 1: Substitution on Benzene; Useful Accompanying Reactions

Electrophilic Aromatic Substitution 2: Substitution on Mono- and Disubstituted Benzene and Other Aromatic Rings

The Dielsalder Reaction and Other Pericyclic Reactions

Reactions Involving Free Radicals

Polymers

Filters

Which is more acidic,H_A or H_B? Explain.

Which hydrogen has the lowest Pk_a?