Which of the following halides will be most reactive towards `S_(N^(2))` reaction?

Which of the following compound will be most reactive toward S_(N)^(1) reaction?

Which of the following halides will be most reactive in S_(N)1 reaction and S_(N)2 reactions, respectively

Which of the following primary halides is most reactive towards SN^1 reaction

Which one is most reactive towards S_(N^(1)) reaction?

Which one is most reactive towards S_(N^(1)) reaction?

Which of the following halide shows highest reactivity towards S_(N)1 reaction ?