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Which of the following statements about [2+2] cycloaddition reactions between two alkenes is true?


A) The reaction is initiated by heat.
B) The reaction is initiated by light.
C) The product is a cyclopentane derivative.
D) Each reactant contains two electrons that participate in the formation of new bonds.

E) None of the above
F) A) and D)

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Which of the following statements about a * antibonding molecular orbital is true?


A) A * antibonding molecular orbital is formed when two p orbitals of similar phase overlap.
B) A * antibonding molecular orbital is formed when two p orbitals of opposite phase overlap.
C) A * antibonding molecular orbital is a higher-energy molecular orbital than a bonding molecular orbital.
D) Both the statements "a * antibonding molecular orbital is formed when two p orbitals of opposite phase overlap" and "a * antibonding molecular orbital is a higher-energy molecular orbital than a bonding molecular orbital" are true.

E) None of the above
F) B) and D)

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What is the organic product of the following electrocyclic reaction? What is the organic product of the following electrocyclic reaction? A) I B) II C) III D) IV


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

E) A) and B)
F) A) and C)

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How many nodes are present in 5 of 1,3,5,7,9-decapentaene?


A) 2
B) 3
C) 4
D) 5

E) A) and D)
F) All of the above

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How many bonding molecular orbitals are present in 1,3,5,7,9-decapentaene?


A) 4
B) 5
C) 10
D) 12

E) A) and B)
F) None of the above

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Which of the following statements about electrocyclic ring closure is not true?


A) It is an intramolecular reaction.
B) It requires heat or light.
C) The cyclic product contains one more bond and one fewer bond than the reactants.
D) The cyclic product contains one more bond and one fewer bond than the reactants.

E) C) and D)
F) B) and D)

Correct Answer

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Which of the following statements about cycloaddition reactions is not true?


A) Cycloaddition reactions form a cyclic product with two new bonds.
B) The course of the reaction is determined by the symmetry of the molecular orbitals of the products.
C) Cycloaddition reactions are concerted.
D) Cycloaddition reactions are stereospecific.

E) None of the above
F) B) and C)

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What is the major organic product of the following oxy-Cope rearrangement? What is the major organic product of the following oxy-Cope rearrangement? A) I B) II C) III D) IV


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

E) All of the above
F) C) and D)

Correct Answer

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What are the two modes of bond formation in cycloaddition reactions?


A) suprafacial and antarafacial bond formations.
B) superfacial and antifacial bond formations.
C) suprafacial and synfacial bond formations.
D) synfacial and antifacial bond formations.

E) None of the above
F) B) and D)

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What is the correct classification of the following reaction? What is the correct classification of the following reaction? A) cycloaddition reaction B) electrocyclic reaction C) electrophilic reaction D) sigmatropic reaction


A) cycloaddition reaction
B) electrocyclic reaction
C) electrophilic reaction
D) sigmatropic reaction

E) C) and D)
F) None of the above

Correct Answer

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Which of the following statements about an electrocyclic ring-opening reaction is not true?


A) An electrocyclic ring-opening reaction is an intramolecular reaction.
B) An electrocyclic ring-opening reaction requires a source of energy (heat or light) .
C) The product of an electrocyclic ring-opening reaction contains one fewer bond than the reactant.
D) The product of an electrocyclic ring-opening reaction contains one more bond than the reactant.

E) All of the above
F) B) and C)

Correct Answer

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What is the major organic product of the following Cope rearrangement? What is the major organic product of the following Cope rearrangement? A) I B) II C) III D) IV


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

E) None of the above
F) A) and B)

Correct Answer

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