Correct Answer - A
`CH_(3)COOH overset(LiAlH_(4))toCH_(3)underset(X)(CH_(2))OH underset(300^(@)C)overset(Cu)tounderset(Y)(CH_(3)CHO) overset("dil. "NaOH)toCH_(3)-underset(underset(Z)(OH))underset(|)(C)H-CH_(2)CHO`
Acetaldehyde (Y) undergoes aldol condensation in presence of dilute caustic alkali to form aldol.