Compound Z is made by the reaction sequence shown below. $\text{CH}_3\text{CH}_2\text{Br}$ $\xrightarrow[\text{in ethanol}]{\text{warm with KCN}}$ compound X $\xrightarrow[\text{dilute HCl}]{\text{reflux}}$ compound Z What is the molecular formula of compound Z?
- A$\text{CH}_3\text{CH}_2\text{Cl}$
- B$\text{CH}_3\text{CH}_2\text{CN}$
- C$\text{CH}_3\text{COOH}$
- D$\text{CH}_3\text{CH}_2\text{COOH}$