Paraldehyde is

For the given compound,determine the number of hydrogen atoms that are replaced by $D$ upon keeping it for a long time with $\mathop O\limits^\ominus D / D_2O$.

Which of the following compounds would undergo aldol condensation?

Give the reactivity order towards $HCN$ for the following compounds:
$(I)$ $Ph-CO-CH_3$
$(II)$ $CH_3-CO-CH_3$
$(III)$ $CH_3-CHO$
$(IV)$ $Ph-CO-CH_2-CH_3$

Which of the following compounds will not undergo the Cannizzaro reaction when treated with $50\%$ aqueous alkali?

The reaction sequence is as follows:
$HOOC-CH_2-CH_2-CH_2-CH_2-COOH$ $\xrightarrow[BaCO_3]{\Delta} A$ $\xrightarrow{NH_2-NH_2} B$ $\xrightarrow[KOH]{\text{heat}} C$
The final product $(C)$ obtained is: