What product is obtained when acetylene is passed through dilute sulfuric acid containing $Hg^{2+}$ ions?

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

Which of the following will produce a chiral molecule after treatment with $H_2$/Lindlar's catalyst?

The isomerisation of $1-$butyne to $2-$butyne can be achieved by treatment with

$2,3$-dibromobutane can be converted to $2$-butyne in a two-step reaction using:

Given below are two statements:
Statement $I$: One mole of propyne reacts with excess of sodium to liberate half a mole of $H_2$ gas.
Statement $II$: Four $g$ of propyne reacts with $NaNH_2$ to liberate $NH_3$ gas which occupies $224 \ mL$ at $STP$.
In the light of the above statements,choose the most appropriate answer from the options given below: