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Which of the following statements about a thermal reaction involving an even number of electron pairs is true?


A) A thermal reaction involving an even number of electron pairs is conrotatory or suprafacial.
B) A thermal reaction involving an even number of electron pairs is conrotatory or antarafacial.
C) A thermal reaction involving an even number of electron pairs is disrotatory or suprafacial.
D) A thermal reaction involving an even number of electron pairs is disrotatory or antarafacial.

E) A) and C)
F) C) and D)

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Which of the following statements about sigmatropic rearrangements and orbital symmetry isnot true?


A) In an antarafacial rearrangement, the news bond forms on the opposite side of thep system as the brokens bond.
B) Reactions involving six atoms or fewer must take place by suprafacial pathways.
C) In a suprafacial rearrangement, the news bond forms on the opposite side of thep system as the brokens bond.
D) In a suprafacial rearrangement, the news bond forms on the same side of thep system as the brokens bond.

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

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Which of the following statements about molecular orbitals is true?


A) The number of molecular orbitals formed is equal to the number of atomic orbitals used.
B) The number of molecular orbitals formed is equal to twice the number of atomic orbitals used.
C) The number of molecular orbitals formed is different from the number of atomic orbitals used.
D) The number of molecular orbitals formed is equal to half the number of atomic orbitals used.

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

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