Question

Lindlar's catalyst is:

• A. \( \text{Platinum chloride + calcium carbonate + lead acetate} \)
• B. \( \text{Palladium chloride + calcium carbonate + lead acetate} \)
• C. \( \text{Chromic acid + lead acetate} \)
• D. \( \text{Palladium(III) bis(acetylacetonate)} \)

Hint:

Lindlar's catalyst selectively produces cis-alkenes, making it essential in organic synthesis.

Answer 1

The Correct Option is B

Lindlar’s catalyst is a poisoned catalyst used for selective hydrogenation of alkynes to cis-alkenes. It consists of palladium chloride supported on calcium carbonate with lead acetate as a poison. The lead acetate reduces catalytic activity, preventing complete hydrogenation to alkanes.