The color of the solution with indicator changes from blue to yellow after different time intervals
name: Alkaline hydrolysis of haloalkanes leads to a change in the reaction medium from an alkaline to acid due to the formation of HBr
Tert-butyl halide is suspect to alkaline hydrolysis like all haloalkanes.
Hydrolysis of the t-butyl halide proceeds via a mechanism forming a carbocation (SN1).
R-X --> R+ → R-OH
The reaction rate doesn't depend on the concentration of the nucleophile, but depends on the nature of the substrate. Bromine is a better leaving group than chloro, so the reaction with t-butyl bromide proceeds much faster. The color change of the indicator is due to changes in the reaction medium from alkaline to acid due to the formation of hydrogen bromide.