The reaction of butanal with $n$-propylmagnesium bromide gives a

$x$ is the product obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. $y$ is the product obtained from but$-2-$ene by ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of $x$ and one mole of $y$ react with each other in the presence of alkali followed by heating?

$A$ 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.

Which of the following compounds will undergo self-aldol condensation in the presence of cold dilute alkali?

Acetone on treatment with $CH_3MgI$ and on further hydrolysis gives:

Grignard's reagent reacts with ethanal (acetaldehyde) and propanone to give: