Why Does C6H5CH(Cl)CH3 < (CH3)3 CCl < C6H5C(CH3)2 Cl Undergo SN1 Reaction?

[desmond iking]

Homework Statement

i was told that the the ascending order of the compound undergo SN1 reaction is C6H5CH(Cl)CH3 < (CH3)3 CCl < C6H5C(CH3)2 Cl... it's a past year question . I am sure tha ans is correct. Can someone explain why? Generally , the most reactive is the compound (CH3)3 CCl , Am i right? this is because the (CH3)3 C+ is surrounded by three electron donating group , so it stabilise the carbonium ion formed.btw , the phenyl is an electron withdawing group , it draw the elctrons away form the C atoms , making the partial positive charge of the carboium ion formed more higher...

Homework Equations

The Attempt at a Solution

 

[desmond iking]

i was told that the phenyl exerts positive inductive effect? why the phenyl isn't exerts negative inductive effect?