Deck 11: Conjugation, Resonance, and Dienes

Question 1

What is the major product of the following reaction?

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

Answer 1

II

Question 2

Which of the following statements about the Diels-Alder reaction is true?

A) The diene can react only when it adopts thes-trans conformation.
B) The stereochemistry of the dienophile is retained in the product.
C) Electron-donating substituents in the dienophile increase the reaction rate.
D) Electron-withdrawing substituents in the diene increase reaction rate.

Answer 2

The stereochemistry of the dienophile is retained in the product.

Question 3

What is the major product of the following reaction?

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

Answer 3

I

Question 4

Which of the following is (are) conjugated dienes?

A) Only I and II
B) I, II, and III
C) Only I
D) Only II

Question 5

What is the major product of the following reaction?

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

Question 6

What is the major product of the following reaction?

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

Question 7

Which of the following isnot a feature of the Diels-Alder reaction?

A) Three ? bonds break.
B) They are initiated by peroxides.
C) They are concerted.
D) They form new six-membered rings.

Question 8

Why would the compound below not react with a dienophile in a Diels-Alder reaction?

A) There are no electron withdrawing groups on the compound.
B) The compound cannot adopt thes-cis conformation.
C) The compound is not a conjugated diene.
D) There are no electron donating groups on the compound.

Question 9

Which of the following molecules is a naturally occurring conjugated diene?

A) Acetylene
B) None of these are correct.
C) Isoprene
D) Ethylene