The reaction of calcium carbide with water produces.......

$X$ (Symmetrical alkyne) $\xrightarrow{Hg^{2+}/H_3O^{+}}$ $2-$butanone. Which compound reacts with $Ag$ powder to give $X$?

In the reaction $CaC_2 + H_2O \to A \xrightarrow{H_2SO_4/HgSO_4} B$,what are $A$ and $B$?

Acetylene shows ........... in its reaction with silver nitrate.

$2-$butyne is reduced to $trans-but-2-ene$ using:

Which one of the following is more acidic?