3-methylbutan-2-olhydrogen bromide⟶Δ2-bromo-2-methylbutanewaterThis is a "Unimolecular Nucleophillic Substitution (SN1)"-reaction.Same reagents3-methylbutan-2-ol + hydrogen bromide → 2-bromo-3-methylbutane + waterPotentially competing3-methylbutan-2-ol + hydrogen bromide → 2-bromo-3-methylbutane + water