Acetylene is prepared in the industry by the action of water on ………

The dihalogen derivatives of alkanes when heated with …………. form corresponding alkynes.

Alkynes readily undergo …………. reaction.

Liquid bromine reacts with acetylene to form ………

When acetylene is passed through dil $H_{2}S{O}_{4}H\_2\; SO\_4$ in the presence of 1% mercuric sulphate, the compound formed is ………

The compounds which contain at least one benzene ring are ………

Which of the following compounds does NOT contain any benzene rings in their structure?

Benzene undergoes ………

If the substituents are on the adjacent carbon atoms in the benzene ring, it is called ………

How many molecules of acetylene are required to form benzene?