Interpretation:
The structure of the expected product 2 and 3 for the given synthesis has to be drawn.
Concept introduction:
Lindlar reduction: The
Benzyl bromide acts as protecting reagent which is used to protect hydroxyl group.
Reducing agent:
Sodium hydride is a strong base that used to remove the hydroxyl protons.
Partial hydrogenation: Metal like palladium on calcium carbonate that's been doped with lead. It's used for the hydrogenation of alkynes to alkenes, not for complete reduction like alkyne to alkane.
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