The answer is C
The reason is that SN1 mechanism only involve one species to substitute one at a time so 1 molecule is in the rate determining step.
Additional, SN2 mechanism involve one species breaking away and one substitute at the same time so 2 molecule is in the rate determining step.
The reason is that SN1 mechanism only involve one species to substitute one at a time so 1 molecule is in the rate determining step.
Additional, SN2 mechanism involve one species breaking away and one substitute at the same time so 2 molecule is in the rate determining step.
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