The final product obtained by heating ethyne in the presence of $HgSO_4$ and dilute $H_2SO_4$ at $333 \ K$ is .........

Which is the most reactive hydrocarbon among the following?

Heating a mixture of silver powder and $CHCl_3$ yields which compound?

Identify the compound $(Z)$ in the following reaction sequence: $CH_3-CH(Br)-CH_2Br$ $\xrightarrow{alc. KOH, \Delta}$ $\xrightarrow{NaNH_2}$ $\xrightarrow{H_2O, Hg^{2+}, H^+} (Z)$

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

Give the method of preparation of ethyne (acetylene) from vicinal dihalides.