The reaction in which $NaCN/C_2H_5OH/HOH$ is used is:

What are $X$ and $Y$ respectively in the following reactions?
$C_6H_5COOH \xrightarrow{X} C_6H_5CHO$
$C_6H_5CHO \xrightarrow[OH^-, 293 \ K]{C_6H_5COOH} Y \text{ (Major product)}$

Which of the following can decolorize aldehydes and ketones?

The aldol condensation of $CH_{3}CHO$ results in the formation of

An aldehyde or ketone containing at least one $\alpha-H$ atom reacts with dilute $NaOH$ to form a $\beta-$hydroxy aldehyde or $\beta-$hydroxy ketone. This reaction is known as $—$

$Ph-CH=CH-CHO + CH_3-CH=CH-CHO \xrightarrow[EtOH, \Delta]{\text{base}} (A) (87\%)$; The product of this reaction is: