a) i) write the equations for the steps in `SN1` mechanism of the conversion of tertiary butyl bromide in to tertiary butyl alcohol.
ii) Haloarenes are less reactive towards nucleophilic substitution reactions than Haloalkanes. Give a reason. 

Explanation

a) The mechanism involves the following two steps.
Step 1: Formation of carbocation: t-butyl bromide undergoes ionization to form a t-butyl carbocation.

This step is the slowest step hence it is the rate determining step.
Step - 2 : Attack of nucleophile on the carbocation : The nucleophile `OH^(-)` can attack the carbocation either from from front side or back side to form t - butyl alcohol. This step is fast.

`therefore` Rate of the reaction is directly `alpha" [ t - butyl bromide]"^(1)[OH^(-)]^(0)`
`therefore` Order = 1
ii) Haloarences are resonance stabilised with carbon halogen double bond.