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

$CH_3COOH$ is reacted with $CH \equiv CH$ in the presence of $Hg^{2+}$,the product is:

Acetylene cannot react with which of the following?

Which is the most acidic of the following?

The compound $C_3H_4$ has a triple bond,which is indicated by its reaction with

For the alkyne with formula $C_6H_{10}$,the number of alkynes with acidic hydrogens is $x$ and the number of alkynes with no acidic hydrogens is $y$. $x$ and $y$ are respectively: