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The explanation involves understanding the mechanisms and the molecular orbital interactions in cycloaddition reactions, specifically the [2+2] cycloaddition. ### Photo-induced [2+2] Cycloaddition (Allowed): In photo-induced [2+2] cycloadditions, light (typically UV light) is absorbed by the reactant molecules, promoting them to an excited state. In the excited state, the molecule’s electronic configuration is altered, and this allows the reaction to proceed. The primary factor here is the symmetry of the molecular orbitals involved: - The _____ _________ ____ _______ ______ __________.
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