There is an overall 29-fold difference in reactivity of 1-chlorohexane, 2-chlorohexane, and 3-chlorohexane toward potassium iodide in

Question:

There is an overall 29-fold difference in reactivity of 1-chlorohexane, 2-chlorohexane, and 3-chlorohexane toward potassium iodide in acetone. (a) Which one is the most reactive? Why?
(b) Two of the isomers differ by only a factor of 2 in reactivity. Which two are these?
Which one is the more reactive? Why?