Here are some different [https://collegedunia.com/exams/photochemical-reactions-science-articleid-653 types of photochemical reactions]-
* Photo-dissociation: AB + hν → A* + B*
* Photo induced rearrangements, isomerization: A + hν → B
* Photo-addition: A + B + hν → AB + C
* Photo-substitution: A + BC + hν → AB + C
* Photo-redox reaction: A + B + hν → A− + B+