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Question

A photochemically-induced electrocyclic reaction involves which of a molecule's molecular orbitals?

A
LUMO
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B
LUMO + 1
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C
HOMO
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D
HOMO - 1
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Solution

The correct option is B HOMO
A stereochemistry of electrocyclic reactions is determined by the symmetry of HOMO i.e., Highest occupied molecules orbital, in case of thermal electrocyclic reactions and the photochemical electrocyclic reactions. The electrons in HOMO are highest energy, most loosely held electrons and therefore, most easily moved during reaction.

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