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Question

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

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

The correct option is A HOMO
Pericyclic reaction requires light or heat and are completely stereospecific ; that is a single stereoisomer of the reactant forms a single stereoisomer of the product.
An electrolytic ring closer is an intermoleculer reaction that forms a cyclic product containing one or more σ bond and are fewer π bond than the reactant.
In a thermal reaction, we consider the 'HOMO' of the ground state electronic configuration.
Answer is (A).

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