Which of the following conditions favor the SN1 mechanism as opposed to the SN2 mechanism?

I. tertiary alkyl halide II. primary alkyl halide III. polar solvent

A. only I B. only II C. I and III D. II and III

Solution: SN1 mechanism is favored by tertiary alkyl halide (will make the most stable carbocation) and polar solvent. Choice C is correct.