Which of the following is Lindlar catalyst?
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
Which of the following is Lindlar catalyst?
- a
Zinc chloride and HCl
- b
Cold dilute solution of
- c
Sodium and Liquid
- d✓
Partially deactivated palladised charcoal
Partially deactivated palladised charcoal
Lindlar Catalyst:
Lindlar catalyst is partially deactivated (poisoned) palladium on calcium carbonate (or barium sulphate), treated with lead acetate and quinoline.
Key features:
- Pd deposited on or
- Deactivated with lead acetate () and quinoline
- Used for partial hydrogenation of alkynes to cis-alkenes
Why "partially deactivated palladised charcoal"? The option describes the essential feature — Pd (palladium) on a support, deactivated to prevent over-reduction.
Other options:
- ZnCl₂/HCl: Lucas reagent (for alcohol classification)
- Cold dil. KMnO₄: Baeyer's reagent (for oxidation/unsaturation test)
- Na/liq. NH₃: Birch reduction
Answer: Option (4)
Practice this question with progress tracking
Want timed practice with adaptive difficulty? Solve this question (and hundreds more from d & f-Block Elements) inside The Crucible, our adaptive practice platform.
More JEE Main d & f-Block Elements PYQs
Iron(III) catalyses the reaction between iodide and persulphate ions, in which: A. Fe3+ oxidises the iodide ion B. Fe3+ oxidises the persulphate ion C. Fe2+ reduces the iodide ion D. Fe2+ reduces the…
The pair of lanthanides in which both elements have high third-ionization energy is: (1) Dy, Gd (2) Lu, Yb (3) Eu, Yb (4) Eu, Gd
Which one amongst the following are good oxidising agents? (a) Sm2+ (b) Ce2+ (c) Ce4+ (d) Tb4+ Choose the most appropriate answer from the options given below :
Which of the following elements have half-filled f-orbitals in their ground state ? (Given : atomic number Sm — 62; Eu = 63; Tb = 65; Gd = 64, Pm = 61) Choose the correct answer from the options…
The correct order of basicity of oxides of vanadium is: