For an odd number of electron pairs (double bonds),for cycloadditions reactions which of the following rules is correct?:

Question

Quizplus · Accepted Answer

Under thermal conditions, cycloadditions involving an odd number of electron pairs (double bonds) proceed via a suprafacial approach on one component and an antarafacial approach on the other, if sterically feasible. Under photochemical conditions, the reaction can proceed via an antarafacial approach due to the excited state of the electrons, but this is less common and more dependent on the specific reaction conditions and molecular geometry. The general rule for thermal conditions aligns with the Woodward-Hoffmann rules, which predict that pericyclic reactions involving an odd number of electron pairs proceed suprafacially for one component.

For an Odd Number of Electron Pairs (Double Bonds),for Cycloadditions