Identify the correct reactivity order for the S_N1 solvolysis reaction of the following compounds: (i) (ii) (iii)

Step-by-step solution

The rate of S_N1 solvolysis depends on the stability of the carbocation intermediate formed after the leaving group (OTs) departs. Compound (i) forms a secondary carbocation at the C7 position of the bicyclo[2.2.1]heptane system. This carbocation is highly strained due to the rigid bicyclic framework preventing the preferred planar sp^2 geometry, making it unstable. Compound (ii) forms a carbocation at C7. The adjacent double bond at the C2-C3 position provides significant anchimeric assistance (neighboring group p