The simplest alkyne is represented by which of the following?

Benzene is the polymer of

What product is obtained by the oxymercuration of $1$-butyne using $HgSO_4 + H_2SO_4$?

$HC \equiv CH$ $\xrightarrow[20\% \ H_2SO_4]{1\% \ HgSO_4} A$ $\xrightarrow{CH_3MgX} B$ $\xrightarrow{[O]} ?$
What is the final product of the above reaction sequence?

Identify the alkyne formed by the reaction of calcium carbide with water.

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