Which of the Following Statements Concerning Electrocyclic Reactions Is (Are)correct

question 78

Multiple Choice

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

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