When an aldehyde is treated with an excess of monohydric alcohol,what is formed?

Explain the mechanism of nucleophilic addition reactions of aldehyde and ketone compounds.

The compound $(x)$ in the above reaction is:

$X \underset{\text{Reductive}}{\stackrel{\text{Ozonolysis}}{\longrightarrow}} Y + Z$. $Y$ can be obtained by Etard's reaction,$Z$ undergoes disproportionation reaction with concentrated alkali. $X$ could be:

In the following sequence of reactions,the final product $D$ is:

Which of the following transformations can be achieved using $Wolff-Kishner$ reduction conditions?