Question 1

What is the product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV&#10;E) I and IV&#10;F) II and III

Accepted Answer

With low temperature, simple addition to the double bond occurs.

Question 2

What is the product of the following reaction?&#10; &#10;A) I&#10;B) II&#10;C) III&#10;D) IV&#10;E) I and IV&#10;F) II and III

Accepted Answer

With high temperature allylic halogenation occurs.

Question 3

What is the major product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV

Accepted Answer

With NBS allylic bromination occurs.

Question 4

Which of the following describes the molecule?  &#10;A) Cumulated&#10;B) Conjugated&#10;C) Isolated

Accepted Answer

Cumulated systems occur when one carbon atom has 2 double bonds. Conjugated systems have alternating double and single bonds. Isolated systems have double bonds separated by more than one single bond.

Question 5

Which of the following has the highest UV absorbance?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV

Accepted Answer

Structures I and IV are conjugated so will have higher UV absorbance than II and III. IV has more double bonds in conjugation (along with carbonyls in conjugation) than I and will have a much higher UV absorbance. It will actually absorb in the visible spectrum and appear as a colored solution.

Question 6

What is the product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV&#10;E) II and IV&#10;F) I and III

Accepted Answer

Low temperature leads to the kinetic product. The kinetic product is the 1,2 addition to the double bond.

Question 7

What is the product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV&#10;E) II and IV&#10;F) I and III

Accepted Answer

High temperatures produce the thermodynamic product. The thermodynamic product is the 1,4 addition to the double bond.

Question 8

What is the major product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV

Accepted Answer

This reaction produces the Diels-Alder adduct. The Diels-Alder reaction almost always produces at its core a cyclohexene ring.

Question 9

What is the major product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV

Accepted Answer

This reaction produces the Diels-Alder adduct. The Diels-Alder reaction almost always produces at its core a cyclohexene ring. The stereochemistry of the dienophile (trans) is retained in the 6 member ring product. When you use a cyclic diene you will produce a bicyclic
product.

Question 10

What is the major product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV

Accepted Answer

This reaction produces the Diels-Alder adduct. The Diels-Alder reaction almost always produces at its core a cyclohexene ring. When you use a cyclic diene you will produce a bicyclic product that primarily favors the end product.

Question 11

What is the major product of the following reaction?  &#10;A) I&#10;B) II&#10;C) III&#10;D) IV

Accepted Answer

The answer of What is the major product of the...

Deck 13: Conjugated Unsaturated Systems