Which of the following compounds does not give an Aldol condensation reaction?

In the given reaction sequence,$Z$ is a mixture of alcohol and acid. The reaction for the conversion of $Y$ to $Z$ is:
$CH_3CH_2OH$ $\xrightarrow[443 \ K]{\text{Conc. } H_2SO_4} X$ $\xrightarrow[(2) \ Zn/H_2O]{(1) \ O_3} Y$ $\xrightarrow[(ii) \ H^+]{(i) \ \text{Conc. } NaOH} Z$

Complete each synthesis by providing the missing starting material, reagent, or products for the following reactions:

Which of the following compounds cannot form iodoform?

Pyrolysis of acetone gives $CH_2=C=O$ called

$HCDO \xrightarrow[{(50\%)}]{{OH^{-}}}$ Product of this Cannizzaro reaction is: