A) Cycloaddition reaction
B) Electrocyclic reaction
C) Electrophilic reaction
D) Sigmatropic reaction
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A) 3
B) 4
C) 5
D) 6
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A) [1,3]
B) [1,5]
C) [3,3]
D) [3,1]
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A) I
B) II
C) III
D) IV
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A) 0
B) 1
C) 2
D) 3
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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 s electrons that participate in the formation of new bonds.
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A) Because the reaction is initiated by heat; the diene has four p electrons and the dienophile has two p electrons.
B) Because the reaction is initiated by light; the diene has four p electrons and the dienophile has two p electrons.
C) Because the reaction is initiated by heat; the dienophile has four p electrons and the diene has two p electrons.
D) Because the reaction is initiated by light; the dienophile has four p electrons and the diene has two p electrons.
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A) Pericyclic reactions occur by way of ionic intermediates.
B) Pericyclic reactions occur by way of radical intermediates.
C) Pericyclic reactions involve multiple steps.
D) Reactive intermediates are not formed in pericyclic reactions.
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A) In pericyclic reactions,bonds are broken and formed in multiple steps.
B) In pericyclic reactions,all bonds are broken and formed in a single step.
C) One intermediate has been identified in pericyclic reactions.
D) The transition state in a pericyclic reaction is acyclic.
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A) 4
B) 5
C) 10
D) 12
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A) 0
B) 2
C) 4
D) 6
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A) 0
B) 2
C) 4
D) 6
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A) 0
B) 1
C) 2
D) 3
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A) [1,3]
B) [1,4]
C) [3,3]
D) [1,5]
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A) Thermal cycloadditions involving an even number of p bonds proceed by a suprafacial pathway.
B) Thermal cycloadditions involving an odd number of p bonds proceed by an antarafacial pathway.
C) Photochemical cycloadditions involving an even number of p bonds proceed by an antarafacial pathway.
D) Photochemical cycloadditions involving an even number of p bonds proceed by a suprafacial pathway.
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A) An electrocyclic reaction is generally irreversible.
B) Generally,an acyclic triene is favored over a six-membered ring at equilibrium.
C) Generally,a four-membered ring is favored over an acyclic diene at equilibrium.
D) An electrocyclic reaction is generally reversible.
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A) [2+2]
B) [4+2]
C) [4+4]
D) [0+2]
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A) Cycloaddition reaction
B) Electrocyclic reaction
C) Electrophilic reaction
D) Sigmatropic reaction
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A) Only I
B) Only II
C) Only III
D) Only I and II
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A) The Cope rearrangement involves the rearrangement of a 1,5-diene to an isomeric 1,5-diene.
B) The Cope rearrangement takes place readily in a suprafacial pathway under photochemical conditions.
C) The Cope rearrangement involves three electron pairs; two in p bonds and one in a s bond.
D) The Cope rearrangement takes place readily in a suprafacial pathway,when heated.
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