$4)$ For a nucleophilic substitution reaction, a nucleophile is necessary. Read through the chemical table and the procedure. What is a nucleophile in today's reaction?

$5)$ A leaving group on a substrate is also required for a nucleophilic substitution. What are the substrates for today's reaction? What is the leaving group? $($hint remember that the reaction mixture is acidic.$)$

$6)$ Draw a generic mechanism for an SN$2$ reaction

$7)$ Draw a generic mechanism for an SN one reaction

$8)$ Which mechanism is favored by a tertiary substrate? Which is favored by a primary substrate?