Question 1

Dienes with adjacent  $\pi$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 2

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 3

Provide the structure for (Z)-2-methyl-2,4-hexadiene.

Accepted Answer

The answer of Provide the structure for (Z)-2-methyl-2,4-hexadiene....

Question 4

What is the IUPAC name for the following compound?

Accepted Answer

A)  (2E, 4Z)-2,4-hexadiene 
B)  (2E, 4Z)-1,4-dimethyl-1,3-butadiene 
C)  (2Z, 4Z)-1,4-dimethyl-1,3-butadiene 
D)  (2Z, 4Z)-2,4-hexadiene 
E)  None of these 
A)  (2E, 4Z)-2,4-hexadiene 
B)  (2E, 4Z)-1,4-dimethyl-1,3-butadiene 
C)  (2Z, 4Z)-1,4-dimethyl-1,3-butadiene 
D)  (2Z, 4Z)-2,4-hexadiene 
E)  None of these

Question 5

Which is the most energetically favorable UV transition for 1,3-butadiene?.

Accepted Answer

A)  n $\rightarrow$  $\sigma$* 
B)  n $\rightarrow$   $\pi$* 
C)  $\pi$2 $\rightarrow$ $\pi$3* 
D) $\sigma$$\rightarrow$  $\sigma$* 
E)  $\pi$1  $\rightarrow$ $\pi$4* 
A)  n $\rightarrow$  $\sigma$* 
B)  n $\rightarrow$   $\pi$* 
C)  $\pi$2 $\rightarrow$ $\pi$3* 
D) $\sigma$$\rightarrow$  $\sigma$* 
E)  $\pi$1  $\rightarrow$ $\pi$4*

Question 6

Vitamin D3 has the following structure. Classify the  $\pi$bonds in vitamin D3 as conjugated, cumulated or isolated.

Accepted Answer

The answer of Vitamin D3 has the following structure. Classify...

Question 7

Identify the color of a compound that absorbs light at 700nm.

Accepted Answer

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

Question 8

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

Accepted Answer

A)  (
E)  2-pentene 
B)  (Z) 2-pentene 
C) . 1-pentene 
D) . 1,3-hexadiene 
E) . 1,3,5-hexatriene 
A)  (
E)  2-pentene 
B)  (Z) 2-pentene 
C) . 1-pentene 
D) . 1,3-hexadiene 
E) . 1,3,5-hexatriene

Question 9

Predict the product for the following reaction.

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  both I & III 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  both I & III

Question 10

Predict the product for the following reaction.

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  both I & III 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  both I & III

Question 11

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 12

Which of the following indicated C-C bond is the shortest?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  both I& II 
A)  I 
B)  II 
C)  III 
D)  both I& II

Question 13

Predict the product for the following electrocyclic reaction.

Accepted Answer

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

Question 14

Which one of the following dienes is least stable?

Accepted Answer

A)  CH3CH=CHCH=CHCH3 
B)  CH3CH=CHCH2CH=CH2 
C)  CH2=CHCH2CH2CH=CH2 
D)  CH2=CHCH(CH3)CH=CH2 
E)  CH3CH=C=CHCH2CH3 
A)  CH3CH=CHCH=CHCH3 
B)  CH3CH=CHCH2CH=CH2 
C)  CH2=CHCH2CH2CH=CH2 
D)  CH2=CHCH(CH3)CH=CH2 
E)  CH3CH=C=CHCH2CH3

Question 15

Provide the structure for (1E,3Z)-1-methoxy-2-methyl-1,3-pentadiene.

Accepted Answer

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

Question 16

Which of the following symbols is used to represent the molar absorptivity of a given compound in UV-Vis region?

Accepted Answer

A) $\lambda$ 
B) $\varepsilon$ 
C) $\nu$ 
D) $\gamma$ 
E) $\alpha$ 
A) $\lambda$ 
B) $\varepsilon$ 
C) $\nu$ 
D) $\gamma$ 
E) $\alpha$

Question 17

Provide the reagents necessary to carry out the following conversion.

Accepted Answer

1. H₂SO₄, he

Question 18

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

Accepted Answer

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

Question 19

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

Question 20

Identify the color of a compound that absorbs light at 400nm.

Accepted Answer

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

Exam 17: Conjugated Pi Systems and Pericyclic Reactions

Dienes with adjacent π\piπ bonds are classified as ______.

Predict the product for the following Diels-Alder reaction.

Provide the structure for (Z)-2-methyl-2,4-hexadiene.

What is the IUPAC name for the following compound?

Which is the most energetically favorable UV transition for 1,3-butadiene?.

Vitamin D3 has the following structure. Classify the π\piπ bonds in vitamin D3 as conjugated, cumulated or isolated.

Identify the color of a compound that absorbs light at 700nm.

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

Predict the product for the following reaction.

Predict the product for the following reaction.

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?

Which of the following indicated C-C bond is the shortest?

Predict the product for the following electrocyclic reaction.

Which one of the following dienes is least stable?

Provide the structure for (1E,3Z)-1-methoxy-2-methyl-1,3-pentadiene.

Which of the following symbols is used to represent the molar absorptivity of a given compound in UV-Vis region?

Provide the reagents necessary to carry out the following conversion.

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

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

Identify the color of a compound that absorbs light at 400nm.

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

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Substitution Reactions

Alkenes: Structure and Preparation Via 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

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

Dienes with adjacent $\pi$ bonds are classified as ______.

Vitamin D₃ has the following structure. Classify the $\pi$ bonds in vitamin D₃ as conjugated, cumulated or isolated. $Vitamin D<sub>3</sub> has the following structure. Classify the \pi bonds in vitamin D<sub>3</sub> as conjugated, cumulated or isolated.$

Which of the following compounds has the longest $\lambda$ _max?

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?