Primary aldehyde on oxidation gives

Identify the final product $D$ in the given reaction sequence:
$CH_3CH_2Cl$ $\xrightarrow{Aq. KOH} A$ $\xrightarrow{PCC} B$ $\xrightarrow{Cl_2/NaOH} C$ $\xrightarrow{Acetone} D$
Product $D$ is known as:

Among the following,the marked proton of which compound shows the lowest $pK_{a}$ value?

Which of the following compounds reacts with $50\%$ sodium hydroxide solution to give the corresponding alcohol and acid?

The major product of the following reaction is:

$HCDO \xrightarrow[{(50\%)}]{{OH^{-}}}$ Product of this Cannizzaro reaction is: