The compound belonging to the homologous series of ethyne is .........

Which reactant is used to prepare trans alkene from alkyne?

The gaseous mixture used for welding of metals is

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

What are $X$ and $Y$ respectively in the following reactions?
$X + 2D_2O \rightarrow C_2D_2 + P$
$Y + 12D_2O \rightarrow 3CD_4 + Q$

$2-$Butyne reacts with $Na$ in liquid $NH_3$ to form: