The major product formed in the following reaction is

Step-by-step solution

Alkyl halide is 1^ . Keep in mind 1^ halide give product by S _ N 2 / E -2 mechanism and 1^ halide always gives substitution reaction except when strongly hindered base is used. e.g., with it gives mainly elimination. The reaction involves carbocation intermediate. i.e. but as it is a primary carbocation it will rearrange to give a tertiary carbocation, which completes the reaction Stability of carbocation : 3^ >2^ >1^ > CH ₃ It is because the stability of a charged system is increased by dispersal of the charge. T