Cannizzaro's reaction is not given by

$2,2-$dichloropropane $\stackrel{Aq. KOH}{\longrightarrow} A$ $\xrightarrow{\text{Clemmensen reduction}} B$. $B$ is

What is the product of the following reaction?

Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions.
$(i)$ Ethanal,Propanal,Propanone,Butanone.
$(ii)$ Benzaldehyde,$p-$Tolualdehyde,$p-$Nitrobenzaldehyde,Acetophenone.
Hint: Consider steric effect and electronic effect.

Which of the following reagents is suitable for the preparation of the product in the above reaction?

The structures of major products $A$, $B$, and $C$ in the following reaction sequence are: