Step 1: Understand the reaction sequence.
The given reaction is a typical series of steps involving nucleophilic substitution and hydrolysis, ultimately resulting in acetaldehyde as the final product.
Step 2: Conclusion.
The correct product is \( \text{CH}_3 \text{CHO} \).
Final Answer:
\[
\boxed{\text{CH}_3 \text{CHO}}
\]