A) Suprafacial and antarafacial bond formations
B) Superfacial and antifacial bond formations
C) Suprafacial and synfacial bond formations
D) Synfacial and antifacial bond formations
F) B) and C)
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A) Thermal cycloadditions involving an even number of pbonds proceed by a suprafacial pathway.
B) Thermal cycloadditions involving an odd number of pbonds 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.
F) A) and C)
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A) [2+2]
B) [4+2]
C) [4+4]
D) [0+2]
F) All of the above
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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.
F) None of the above
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A) I
B) II
C) III
D) IV
F) A) and C)
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A) A p* antibonding molecular orbital is formed when two p orbitals of similar phase overlap.
B) A p* antibonding molecular orbital is formed when two p orbitals of opposite phase overlap.
C) A p* antibonding molecular orbital is a higher-energy molecular orbital than a p bonding molecular orbital.
D) Both the statements "a p* antibonding molecular orbital is formed when two p orbitals of opposite phase overlap" and "a p* antibonding molecular orbital is a higher-energy molecular orbital than a p bonding molecular orbital" are true.
F) B) and C)
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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.
F) A) and D)
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