The strongest acid amongst the following compounds is

In the given transformation, which the following is the most appropriate reagent?

The major product obtained in the following reaction is:

The major product of the following reaction is:

$\mathrm{R}-\mathrm{C}\equiv \mathrm{N}\underset{\left(2\right){\mathrm{H}}_2\mathrm{O}}{\overset{\left(1\right){\mathrm{AH}}_1-\mathrm{Bu}{)}_2}{\to }}$?

The major product $\text{'}\mathrm{X}\text{'}$ formed in the following reaction is:

The major product obtained in the following reaction is:

The major product of the following reaction is: