Dave presents a synthesis challenge to convert trans-butene to cis-butene in three steps. He outlines a strategy involving dehalogenation, elimination reactions, and selective hydrogenation using Lindlar's catalyst. The exercise is a thought experiment to apply known reactions and strategies.

What is the main synthesis challenge discussed in the text?

What are the two elimination reactions mentioned, and why are they necessary?

Explain the significance of dehalogenation in the synthesis strategy.

Describe the method used to convert an alkyne to a Z alkene.

What role does Lindlar's catalyst play in the synthesis process?