Alkynes are hydrocarbons with carbon-carbon triple bonds in them. The simplest alkyne can be prepared by the process shown in Reaction 1.
Also consider the following reactions.
Quinoline is a heterocyclic amine.
Lindlar's catalyst is often used for the reduction of alkynes to alkenes. The catalyst consists of palladium which is deposited in a finely divided state of barium sulfate, which is subsequently treated with a heterocyclic amine called quinoline. Which of the following is the most likely function of quinoline?