Tischenko reaction is a modification of

The major product formed in the following reaction is:

$A$ compound $(X)$ possesses a smell like bitter almond.
$(i)$ It does not give the Fehling test.
$(ii)$ It gives the silver mirror test.
$(iii)$ Compound $(X)$ gives orange precipitates of benzaldehyde $2,4-$dinitrophenylhydrazone with $2,4-DNP$.
Identify compound $(X)$ and provide its chemical reactions.

Identify the compound $X$ in the following reaction.
Acetone $+ X \stackrel{\Delta}{\longrightarrow} CHI_3 \downarrow + CH_3COONa + 2 NaOH$

$3$-hydroxybutanal is formed when $(X)$ reacts with $(Y)$ in dilute $(Z)$ solution. What are $X, Y$ and $Z$?

Which of the following reactions gives a product with a $C=N-N$ linkage and a yellow precipitate?