Which of the following reactions cannot be used to convert $R_2CO$ to $R_2CH_2$?

Self-condensation of two moles of ethyl acetate in the presence of sodium ethoxide yields:

What is formed when benzaldehyde reacts with chlorine in the absence of a catalyst?

Which of the following compounds can show an aldol condensation reaction?

$x$ 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?

Fehling's solution '$A$' is