Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Electrocyclic · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
(I) Conrotatory electrocyclic reaction (II) Disrotatory electrocyclic reaction (III) Valence isomerization (IV) $\left[{ }_{\mathrm{x}}4_{s}+{ }_{\pi}2_{a}\right]$ cycloaddition reaction