KCET 2022 Chemistry Solved Paper

SN1 reaction proceeds via formation of carbocation. In option B, the alkyl halide (1) is 3∘ while (2) is 2∘.
Therefore greater the stability of the carbocation, faster is the rate of SN1 reaction.
Therefore option D, the compound pair of 2-chloro-2 methylpropane and 2chloroheptane is the correct option.