Question

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

• A. Zinc amalgam and concentrated HCl
• B. Hydrazine and KOH in ethylene glycol
• C. Sodium borohydride or Lithium Aluminium hydride
• D. Hydrogen in presence of palladium in Barrium sulphate and quinoline

Answer 1

The correct option is D Hydrogen in presence of palladium in Barrium sulphate and quinoline

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