What is the major product formed when propyne reacts with aqueous $HgSO_4$ in the presence of $H_2SO_4$?

The reaction sequence is as follows:
$CH(COOK)=CH(COOK)_{(aq)}$ $\xrightarrow{\text{electrolysis}} X$ $\xrightarrow[Hg^{2+}]{dil. H_2SO_4} Y$; $Y$ is

$HC \equiv CNa + Cl - CH_2 - CH_2 - CH_2 - I \to (A)$; Major product $(A)$ is

What is the major product of the following reaction?
$Cyclohexyl-C \equiv CH \xrightarrow{HOCl \text{ (excess)}} \text{major product}$

What is the product when $2-$butyne is treated with liquid $NH_3$ in the presence of lithium?

Identify the alkyne in the following sequence of reactions:
Alkyne $\xrightarrow{\text{H}_2, \text{Lindlar's catalyst}} A$ $\xrightarrow{\text{Ozonolysis}} B \text{ (only)}$
Given that $B$ is obtained from $\text{CH}_2=\text{CH}_2$ via the Wacker process.