Question:
Palladised charcoal with quinoline is known as
Palladised charcoal with quinoline is known as
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This partly poisoned palladium catalyst reduces alkynes to cis-alkenes.
Updated On: Nov 12, 2026
- Lucas reagent
- Lindlar's catalyst
- Lindane catalyst
- Tollens' reagent
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Palladium on charcoal that is partly poisoned with quinoline or a sulfur compound is a special catalyst.
Step 2: Its Role
The poisoning stops hydrogenation at the alkene stage, so alkynes are reduced to cis-alkenes.
Step 3: Name
This catalyst is called Lindlar's catalyst.
Step 4: Why the other options fail
Lucas reagent is conc. HCl with anhydrous \(\text{ZnCl}_2\). Tollens' reagent is ammoniacal silver nitrate. Lindane is an insecticide.
Final Answer:
It is called Lindlar's catalyst. \[ \boxed{\text{(B) }\text{Lindlar's catalyst}} \]
Palladium on charcoal that is partly poisoned with quinoline or a sulfur compound is a special catalyst.
Step 2: Its Role
The poisoning stops hydrogenation at the alkene stage, so alkynes are reduced to cis-alkenes.
Step 3: Name
This catalyst is called Lindlar's catalyst.
Step 4: Why the other options fail
Lucas reagent is conc. HCl with anhydrous \(\text{ZnCl}_2\). Tollens' reagent is ammoniacal silver nitrate. Lindane is an insecticide.
Final Answer:
It is called Lindlar's catalyst. \[ \boxed{\text{(B) }\text{Lindlar's catalyst}} \]
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