When $2$-butyne is treated with $Pd-BaSO_4$ (Lindlar's catalyst),the product formed will be:

$C_6H_5-C \equiv C-CH_3 \xrightarrow[H_2SO_4]{HgSO_4, H_2O} A$. The major product $(A)$ is:

The treatment of $CH_3MgX$ with $CH_3-C \equiv CH$ produces

When propyne reacts with aqueous $H_2SO_4$ in the presence of $HgSO_4$,the major product is

What happens when a mixture of acetylene and hydrogen is passed over heated Lindlar's catalyst?

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: