Which of the following statements concerning electrocyclic reactions is (are) correct?
A) The ground state HOMO of a compound with an even number of conjugated double bonds is asymmetric.
B) The allowed mode of ring closure under thermal conditions for a molecule containing an even number of conjugated double bonds is disrotatory.
C) The allowed mode of ring closure under photochemical conditions for a molecule containing an odd number of conjugated double bonds is disrotatory.
D) both B and C
E) none of the above
Correct Answer:
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