Which one among the following will undergoes faster S _ N 1 reaction?

Step-by-step solution

During substitution, when rate of reaction depends only on one concentration term (i.e. commonly a substrate) e.g- alkyl halides. The reaction is of first order and called S _ N 1 reactions. Here, rate substrate or, rate =k[R X] i.e. alkyl halide Step I R X Slow R⁺+X Step II R⁺ Fast OH ⁻ R OH Such type of reaction depends upon the stability of carb-cation formed in first step. It is favoured by heavy (bulky) groups. To show faster S _ N 1 reaction and option (d) is the correct answer.