First reaction is a Condensation Reaction. As a amall molecule (water) is evolved with the production of ether this is called as condensation of alcohols.
Second reaction is Addition Reaction also known as electrophilic addition reaction. Here HBr is added across double bond to yield alkyl halide.
Third reaction is Elimination Reaction. In this reaction tertiary alcohol is treated with base. A unsaturated compound is formed in this reaction.
Last reaction is Substitution Reaction (Aromatic Electrophilic substitution reaction. In this case a electrophile on benzene (Proton) is substituted with another electrophile (Bromine)
