The reagent used to convert an alkyne to an alkene is:

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

Identify $X$ in the following sequence of reactions.
$CH_3-CH(Br)-CH(Br)-CH_2-CH_2-CH_3 \xrightarrow[(ii) Na \text{ in liquid } NH_3]{(i) NaNH_2} X$

The simplest alkyne is represented by

An organic compound $X$ with molecular formula $C_6H_{10}$,when treated with $HBr$,forms a $gem$-dibromide. The compound $X$ upon warming with $HgSO_4$ and dil. $H_2SO_4$,produces a ketone,which gives a positive iodoform test. The compound $X$ is

Acetylene cannot react with which of the following?