I'm confused on how exactly I can explain the reactivities of SN2 (NaI in acetone) and SN1 (AgNO3 in ethanol) reactions with alkyl halides such as 2-chlorobutane, 2-bromobutane, crotyl chloride, etc. Do I explain how the leaving group leaves and the nucleophile attacks the carbon? What is an example explanation and what do I include in the explanation?