Which of the following compounds will not react with phenylhydrazine?

Addition of hydrogen cyanide $(HCN)$ to carbonyl compounds is:

Assertion : Aldol condensation can be catalysed both by acids and bases.
Reason : $\beta$-Hydroxyaldehydes or ketones readily undergo acid-catalysed dehydration.

To distinguish between formaldehyde and acetaldehyde,we require

Which statement is correct for product '$X$'?
$Cl-CO-CH_2-C(C \equiv CH)(CH_2-CN)-CH_2-CH_2-CO-CH_3 \xrightarrow{H_2/Pd/BaSO_4} X$

$CH_3COOH$ $\xrightarrow{LiAlH_4} X$ $\xrightarrow{Cu, 300^{\circ}C} Y$ $\xrightarrow{\text{Dilute } NaOH} Z$. In the above reaction,$Z$ is: