can someone which are Sn1 reactions and which are sn2 reaction. also is if any are unreactive and why.

\begin{tabular}{|c|c|c|} \hline Alkyl Halides & NaI, Acetone & AgNO3, Ethanol \\ \hline 1-chlorobutane & \\ \hline 2-chlorobutane & \\ \hline 2-chloro-2-methylpropane & \\ \hline bromobenzene & \\ \hline 2-bromobutane & \\ \hline \end{tabular}