Which of the following reacts with acetylene to form the war gas Lewisite?

Hydration of propyne results in the formation of.......

How many carbons are in the simplest alkyne having two side chains?

$CH_3 - CH_2 - C \equiv CH \xrightarrow{HgSO_4, H_2SO_4} A$,the compound $A$ is

$A$ compound is treated with $NaNH_2$ to give a sodium salt. Identify the compound.

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