Which of the following compounds will not undergo an aldol condensation reaction?

The product $A$ in the following reaction is:

Consider the given reaction:
$CH_3-CO-CH_3 \xrightarrow{C_6H_5COOOH} CH_3-COO-CH_3$
The above reaction is known as:

The given reaction is an example of an intramolecular aldol condensation. Identify the product $(A)$ formed in the reaction:
$1,5-\text{cyclooctanedione} \xrightarrow{H_2SO_4, H_2O} (A)$

$R-C(=O)H + R-NH_2 \rightarrow R-CH=N-R$. This reaction gives the best yield at:

Identify $(Z)$ in the following reaction:
$CH_3COOH$ $\xrightarrow{LiAlH_4} (X)$ $\xrightarrow{573 \ K, \ Cu} (Y)$ $\xrightarrow{dil.NaOH} (Z)$