SN1 and SN2 reactions

What will be the products (if there will be a reaction) when the following substrates are reacted with 15% NaI in acetone? with 1% AgNO3 in ethanol? Very briefly explain how you were able to make your predictions.
1. bromobenzene
2. bromocyclopentane
3. 1-chlorobutane
4. 1-chloromethylbenzene