Three of the following four reactions are due to one similar feature of carbonyl compounds, while the fourth one is different. Which one is fourth?

The major product 'X' formed in the following reaction is:

Compound $\mathrm{\prime }\mathrm{x}\mathrm{\prime }$ is:

In the following reactions, products $\mathrm{A}$ and $\mathrm{B}$ are:

The major product formed in the following reaction is:

Reagent(s) which can be used to bring about the following transformation is(are)

The major product of the following reaction is:

The major product of the following reaction is:

The major product of the following reaction is:

The increasing order of the reactivity of the following with $\text{L}\text{i}\text{A}\text{l}{\text{H}}_4$ is:

$\left(A\right)$

$\left(B\right)$

$\left(C\right)$

$\left(D\right)$

The major product obtained in the following reaction is: