Which would undergo reaction faster in the following pair:

2-Bromo-2-methylethanewould undergo faster reaction than2-Bromoethane. In this reaction, constant bond making and breaking occurs. In 2-Bromo-2-methylethane there is less steric hinderance than the other compound.The greater the stability of carbocation, greater will be its ease of formation of alkyl halide and so faster will be the reaction rate. In case of alkyl halides, tertiary halide will undergo faster reaction.