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For the conversion of alkyne to cis-alke...

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`.

Text Solution

Verified by Experts

The correct Answer is:
D
Compound III is chiral and shows optical isomerism. Statements a, b, and c are self explanatory.
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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 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. H_(3)C-C-=C-CH_(3)+H_(2) overset(Pd//CaCO_(3))underset("Boiling Quinoline")to (A) The product (A) will be:

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. Answer the following questions: The relative rate of catalytic hydrogenation of following alkenes is:

CENGAGE CHEMISTRY-ALKYNES-Exercises (Multiple Correct Answers Type)
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  3. Which of the statements are correct for alkyne with molecular formula ...

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  4. For the conversion of alkyne to cis-alkene, H2+ Lindlar's catalyst is ...

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  7. Which of the following statement(s) is/are correct:

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  8. Compound (B) is same when (A) is:

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  9. Which of the statements are correct? R--=-R^'underset(+EtOH)overset(...

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  10. Which of the statements are correct? R--=-Runderset(Catalyst)overset...

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  11. Hydroboration oxidation and acid hydration will yield the same product...

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  12. C4H6underset(1 mol)overset(H2+Pt)rarrC4H8overset(O3//H2O)rarr Acedic a...

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  14. Compound (A) does not react with Tollens or Grignard reagent, but afte...

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  15. Compound (A) reacts with [Cu(NH3)2]^(+) and Tollens reagent, but after...

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  16. Which of the statements are correct?

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  17. Reagents used in conversion from (A) to (B) are:

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  18. Which gas is in an antidote of Lewisite (a poisonous gas used in World...

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  19. Which statements are correct:

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  20. Which statements are correct for reagents A, B, C, and D?

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