Identify the major product in the following reaction.
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+\mathrm{KOH}(\mathrm{aq}) \rightarrow ?$
The type of reagent used: Aqueous KOH (Nucleophilic substitution reaction).
Reaction type: Hydrolysis of alkyl halide.
Reaction mechanism $=S N_2$
The Br in $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$ is replaced by -OH forming $\mathrm{CH}_5 \mathrm{OH}$
$$
\mathrm{CH}_5-\mathrm{Br}+\mathrm{KOH}(\mathrm{aq}) \longrightarrow \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}+\mathrm{KBr}
$$