What will be $Y$ in the following reaction?
$C_2H_2$ $\xrightarrow{O_3} X$ $\xrightarrow{Zn/CH_3COOH} Y$

When acetylene is reacted with $HBr$,we get

The reagent used for converting acetylene to oxalic acid is

$\underset{(\text{Calcium carbide})}{CaC_2}$ $\xrightarrow{H_2O} (A)$ $\xrightarrow{\text{Red hot Cu tube}} (B)$. The product $(B)$ of the reaction is:

$A$ mixture of methane,ethylene,and acetylene gases is passed through a Wolf's bottle containing ammoniacal cuprous chloride. The gas coming out is

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