In the reaction $CH_3CHO + HCN \to CH_3CH(OH)CN$,a chiral center is generated. The product will be ........

Benzaldehyde and acetone can be best distinguished using

$HCHO + CH_3CHO$ $\xrightarrow[Heat]{dil. NaOH} A$ $\xrightarrow{HCN, H_3O^+} B$. What is the formula of $B$ in this reaction?

Two compounds $A$ and $B$ with the same molecular formula $(C_{3}H_{6}O)$ undergo Grignard's reaction with methylmagnesium bromide to give products $C$ and $D$. Products $C$ and $D$ show the following chemical tests.

Test	$C$	$D$
Ceric ammonium nitrate Test	Positive	Positive
Lucas Test	Turbidity obtained after five minutes	Turbidity obtained immediately
Iodoform Test	Positive	Negative

$C$ and $D$ respectively are:

In the given reaction,identify $(X)$ and $(Y)$:

$CH_3-CO-CH_2-COOCH_3$ $\xrightarrow[H_2O]{H^{+}} A$ $\xrightarrow{\Delta} B$ $\xrightarrow{HCN} C$. What are $B$ and $C$?