Chapter 21 Multiple Choice Questions

. Which of the following dienophiles is the most reactive with buta-1,3-diene?

. Which of the following dienes cannot undergo Diels-Alder reactions?

. Which of adducts (a)-(d) is the main product of the following Diels-Alder reaction?

. Which of the following is the main product in the ozonolysis of 1,4-dimethylcyclohexene followed by a reductive workup with Zn and ethanoic acid?

. Which of the following is the main product in the ozonolysis of 1,5-dimethylcyclohexene followed by a workup with aqueous H2O2?

. Which of phenols (a)-(d) is the main product of the following thermal rearrangement?

. Which of unsaturated aldehydes (a)-(d) is the sigmatropic rearrangement product obtained by heating the following ether?

. Which of the following reactions is not thermally allowed?

. Which of the following reactions is classified as an ene reaction?

. Which of the following reactions is classified as an electrocyclic reaction?

. Which of the following dienophiles is the most reactive in normal Diels-Alder reactions?

. Which of the following dienophiles is the least reactive in normal Diels-Alder reactions?

. Which of adducts (a)-(d) is the main kinetic product of the following Diels-Alder reaction?

. Which of the following is the main product in the ozonolysis of 1,3-dimethylcyclohexene followed by a workup with Zn and ethanoic acid?

. Which of the following is impossible as a resonance form of ozone?

. Which side-chain carbon makes a new bond to the benzene ring upon Claisen rearrangement of the following allylic phenyl ether?

. The following involves two pericyclic reactions. Which combination indicates correctly the types of reaction involved?

. Which of compounds (a)-(d) is the likely intermediate of the following transformation involving two electrocyclic reactions (ring opening and ring closure)?

. Which of the following reactions is classified as a sigmatropic rearrangement?

. Which of the following is classified as an electrocyclic reaction?

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