Q.

Reduction of ketones cannot be carried out with which of the following reagents ?

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a

Hydrogen in presence of palladium in Barium sulphate and quinoline

b

Sodium borohydride or Lithium aluminium hydride

c

Hydrazine and KOH in ethylene glycol

d

Zinc amalgam and concentrated HCl

answer is D.

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Detailed Solution

  • Reduction of ketones cannot be carried out with hydrogen in presence of palladium in Barium sulphate and quinoline. 
  • This reagent is Lindlar's catalyst and is used for selective reduction of alkyne to trans alkene.
  • In Clemmensen reduction, zinc amalgam and concentrated HCl converts carbonyl group to methylene group.
  • In Wolf Kishner reduction, Hydrazine and KOH in ethylene glycol converts carbonyl group to methylene group.
  • Sodium borohydride or Lithium Aluminium hydride reduces keto groups to alcohols.
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Reduction of ketones cannot be carried out with which of the following reagents ?