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Lindlar' catalyst is:...

Lindlar' catalyst is:

A

Na in liquid `NH_(3)`

B

Pt in ethanol

C

Ni in ether

D

Pd with `BaSO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
D
`BaSO_(4)` works as poison and block active site of Pd.
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Knowledge Check

  • Lindlar's catalyst is

    A
    Na in alcohol
    B
    Rancy nickcl
    C
    `Pd//BaSO_(4)`
    D
    `Na//liq. NH_(3)`

  • Lindlar's catalyst is

    A
    Pt in ethanol
    B
    `Pd + BaSO_(4)`
    C
    Ni in ehanol
    D
    Na in liquid `NH_(3)`

  • For the conversion of alkyne to cis-alkene, H_2+ Lindlar's catalyst is used: Which of the statements are wrong:

    A
    (a) The function of `BaSO_4` or `CaCO_3` is to reduce the surface area of finely divided catalyst Pd so that adsorption of `H_2` on `Pd` is reduced.
    B
    (b) The function of S or quinoline is to remove excess of `H_2`. It is done through the formation of `H_2S(g)` with S or by absorption of excess `H_2` by quinoline to form (I) or (II).
    C
    (c) Boiling xylene acts as a solvent to dissolve the reactant (alkyne).
    D
    (d) Boiling xylene acts as inhibitor, decreasing the asborption of `H_2` on finely divided catalyst `Pd` or `Pt`.

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    Hydrogenation of alkenes and alkynes takes place in presence of certain catalysts. In Sabatier Senderen's reaction, the addition of hydrogen takes place I presence of Raney nickel catalyst. Platininm and palladium can also be used as catalyst and used in finley divided state. Experimentally, it is observed that less crowded alkenes adsorb H_(2) with faster rate. Controlled hydrogenation of alkyne H_(2) with faster rate. Controlled hydrognetation of alkyne in presence of Lindlar's catalyst yields cis product i.e., 'cis' alkene. Thus, in presence of Lindlar's catalyst 'syn' addition takes place. The relative rate of hydrogenation follows the order: Non-terminal alkynes are reduced in presence of Na or Li metal dissolved in liquid ammonia. In this reaction, anti-addition of hydrogen results into the trans-product. Powdered nickel is more effective than grannular nickel because:

    Hydrogenation of alkenes and alkynes takes place in presence of certain catalysts. In Sabatier Senderen's reaction, the addition of hydrogen takes place I presence of Raney nickel catalyst. Platininm and palladium can also be used as catalyst and used in finley divided state. Experimentally, it is observed that less crowded alkenes adsorb H_(2) with faster rate. Controlled hydrogenation of alkyne H_(2) with faster rate. Controlled hydrogenation of alkyne in presence of Lindlar's catalyst yields cis product i.e., 'cis' alkene. Thus, in presence of Lindlar's catalyst 'syn' addition takes place. The relative rate of hydrogenation follows the order: Non-terminal alkynes are reduced in presence of Na or Li metal dissolved in liquid ammonia. In this reaction, anti-addition of hydrogen results into the trans-product. In which of the following cases, the reaction is most exothermic?

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