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​According to the frontier orbital theory,the symmetry of electrocyclic reactions is determined by:


A) ​the total number of double bonds present in the molecule.
B) ​the symmetry of the HOMO.
C) ​the symmetry of the LUMO.
D) ​proper orientation of the HOMO of one atom with the LUMO of the other atom.

E) All of the above
F) None of the above

Correct Answer

verifed

verified

B

​If lobes of like sign are on opposite sides of a molecule,and both orbitals must rotate in the same direction (either both clockwise or both counterclockwise) ,the kind of motion observed is:


A) ​suprafacial.
B) ​antarafacial.
C) ​disrotatory.
D) ​conrotatory.

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

Correct Answer

verifed

verified

D

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