Which of the following halids would undergo nucleophilic substituion most readily ?

Which of the following halides would undergo nucleophilic substitution most readily (SN_1) ?

Which of the following compounds undergoes nucleophilic substitution most readly?

Which of the following compounds undergoes nucleophilic substitution most readly?

Which undergoes nucleophilic substitution most easily-

Which of the following alkyl halide undergoes a nucleophilic substitution reaction via formation of a carbocation ?

Which of the following readily undergo nucleophilic substitution reaction by S_(N)1 mechanism in presence fo butanol-

Which the following compound undergoes nucleophilic substitution reaction most easily