Sivukartta Sulje Reactivity 3. What are the mechanisms of chemical change? Reactivity 3.1 Proton transfer reactions Reactivity 3.1 Proton transfer reactions (HL) Reactivity 3.2 Electron transfer reactions Reactivity 3.2 Electron transfer reactions (HL) Reactivity 3.3 Electron Sharing Reactions Reactivity 3.4 Electron-pair Sharing Reactions (HL) Reactivity 3.4 Electron-pair sharing reactions