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Mechanisms are really just electron-pushing patterns — once you see the logic, they all start making sense. Let's start with the most common one you'll see: nucleophilic substitution (SN2). ⚡ The key idea: a nucleophile (electron-rich) attacks an electrophile (electron-poor carbon), and the leaving group leaves. Example: CH₃Br + OH⁻ → CH₃OH + Br⁻ → OH⁻ attacks the back of the C–Br bond → Br⁻ leaves simultaneously → Configuration INVERTS (like an umbrella flipping) Which mechanism are you covering in class right now? I'll walk through it exactly the way it'll show up on your exam.