This learning resource includes a practice assessment focused on the S_N2 reaction mechanism involving 2-Bromobutane and sodium hydroxide (NaOH) as the nucleophile. Students are instructed to identify the attack position on the given structures of 2-Bromobutane, indicate it with arrows, and draw the attacking NaOH with its correct charge. The exercise emphasizes drawing the overall reaction, showing bond formation and breaking as well as electron flow. The assessment requires an understanding of nucleophilic substitution reactions, specifically the backside attack mechanism, and the behavior of bromine as a leaving group. The resource promotes active participation in drawing, labeling, and understanding the concepts related to organic chemistry reactions.