The given reaction is: $R_2C=O + HCN \rightarrow R_2C(OH)CN$

Which of the following does $NOT$ exhibit haloform reaction?

The reagent$(s)$ which can be used to bring about the following transformation is(are):
$(A)$ $LiAlH_4$ in $(C_2H_5)_2O$
$(B)$ $BH_3$ in $THF$
$(C)$ $NaBH_4$ in $C_2H_5OH$
$(D)$ Raney $Ni / H_2$ in $THF$

Which of the following compounds has the greatest extent of hydration?

What is the percentage of formaldehyde in formalin (in $\%$)?

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