How does the protonation of a hydroxyl group affect the reactivity of a molecule?

Protonation of a hydroxyl group increases the reactivity of a molecule by making it more likely to participate in chemical reactions. This is because the addition of a proton to the hydroxyl group increases its positive charge, making it more attractive to other molecules or ions that are negatively charged. This can lead to the formation of new bonds or the breaking of existing bonds, ultimately changing the overall chemical behavior of the molecule.