1. Which of the following statements about the mechanism of the Diels-Alder reac

Question

1. Which of the following statements about the mechanism of the Diels-Alder reaction is
true?
A) Three pi bonds break; two sigma bonds and one pi bond form.
B) Three pi bonds break; one sigma bond and two pi bonds form.
C) Two pi bonds break; one sigma bond and one pi bond form.
D) Two pi bonds break; two sigma bonds and one pi bond form.

2. Which of the following statements about the Diels-Alder reaction is true?
A) The diene can react only when it adopts the s-trans conformation.
B) Electron-withdrawing substituents in the diene increase reaction rate.
C) Electron-donating substituents in the dienophile increase the reaction rate.
D) The stereochemistry of the dienophile is retained in the product.

Explanation / Answer

A) Three pi bonds break; two sigma bonds and one pi bond form. C) Electron-donating substituents in the dienophile increase the reaction rate.

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