When acetylene reacts with $HCl$ in the presence of $HgCl_2$,the product is

Cyclo$[18]$ carbon is an allotrope of carbon with molecular formula $C_{18}$. It is a ring of $18$ carbon atoms, connected by alternating single and triple bonds. The total number of triple bonds present in this cyclocarbon is:

Which of the following reactions will yield $2, 2-$dibromopropane?

Explain the polymerization of alkynes. Or,give the types of polymerization of alkynes and provide a note on each.

The synthesis of $3-$octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are

The products of the reaction $CH_3 - C \equiv C - CH_2CH_3 \xrightarrow[(ii) \text{ Hydrolysis}]{(i) O_3}$ are .....