World 4 · Substitution & Elimination · 8 min · PRONucleophile or base?
The same species, two different jobs
PRO · Organic Chemistry
World 4: Substitution & Elimination is part of PRO
The first world of Organic Chemistry is free. PRO opens the other 43 lessons in 7 worlds — simulations, quizzes and all.
PRO includes
- All 26 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly