which one of the following compounds CH3Br and CH3I, will react faster in an Sn1 reaction with -OH

Reactivity of alkyl halide towards SN1 reaction is as follows:
R-I>R-Br>R-Cl>R-F
So, CH3I will react faster in SN1 reaction.
The reason for the reactivity is the relative order of bond dissociation energy.
For CH3I, the bond dissociation energy of CH3-I bond is minimum and hence formation of carbocation is faster so, the rate of reaction is also faster.

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